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parse_url

(PHP 4, PHP 5)

parse_url — 解析 URL，返回其组成部分

说明

mixed parse_url ( string $url [, int $component = -1 ] )

本函数解析一个 URL 并返回一个关联数组，包含在 URL 中出现的各种组成部分。

本函数不是用来验证给定 URL 的合法性的，只是将其分解为下面列出的部分。不完整的 URL 也被接受， parse_url() 会尝试尽量正确地将其解析。

参数

url: 要解析的 URL。无效字符将使用 _ 来替换。

component: 指定 PHP_URL_SCHEME 、 PHP_URL_HOST 、 PHP_URL_PORT 、 PHP_URL_USER 、 PHP_URL_PASS 、 PHP_URL_PATH 、 PHP_URL_QUERY 或 PHP_URL_FRAGMENT 的其中一个来获取 URL 中指定的部分的 string 。（除了指定为 PHP_URL_PORT 后，将返回一个 integer 的值）。

返回值

对严重不合格的 URL， parse_url() 可能会返回 FALSE 。

如果省略了 component 参数，将返回一个关联数组 array ，在目前至少会有一个元素在该数组中。数组中可能的键有以下几种：

scheme - 如 http
host
port
user
pass
path
query - 在问号 ? 之后
fragment - 在散列符号 # 之后

如果指定了 component 参数， parse_url() 返回一个 string （或在指定为 PHP_URL_PORT 时返回一个 integer ）而不是 array 。如果 URL 中指定的组成部分不存在，将会返回 NULL 。

更新日志

版本	说明
5.4.7	修复了 host 在协议省略时的识别。
5.3.3	在 URL 解析失败时将不会产生 `E_WARNING` 级别的错误。
5.1.2	增加了参数 `component`。

范例

Example #1 parse_url() 例子

  <?php
$url  =  'http://username:password@hostname/path?arg=value#anchor' ;

 print_r ( parse_url ( $url ));

echo  parse_url ( $url ,  PHP_URL_PATH );
 ?>

以上例程会输出：

Array
(
    [scheme] => http
    [host] => hostname
    [user] => username
    [pass] => password
    [path] => /path
    [query] => arg=value
    [fragment] => anchor
)
/path

Example #2 parse_url() 解析丢失协议的例子

  <?php
$url  =  '//www.example.com/path?googleguy=googley' ;

 // 在 5.4.7 之前这会输出路径 "//www.example.com/path"
 var_dump ( parse_url ( $url ));
 ?>

以上例程会输出：

array(3) {
  ["host"]=>
  string(15) "www.example.com"
  ["path"]=>
  string(5) "/path"
  ["query"]=>
  string(17) "googleguy=googley"
}

注释

Note:

本函数不能用于相对 URL。

Note:

parse_url() 是专门用来解析 URL 而不是 URI 的。不过为遵从 PHP 向后兼容的需要有个例外，对 file:// 协议允许三个斜线（file:///...）。其它任何协议都不能这样。

参见

pathinfo() - 返回文件路径的信息
parse_str() - 将字符串解析成多个变量
http_build_query() - 生成 URL-encode 之后的请求字符串
http_build_url() - 产生一个 URL
dirname() - 返回路径中的目录部分
basename() - 返回路径中的文件名部分
» RFC 3986

用户评论:

[#1] mostafa at alfehrest dot org [2015-10-12 16:40:48]

This function will attempt to parse relative URLs but relaying on it can produce unexpected behavior that can cause some hard to track bugs. (The following results are obtained from PHP 5.5.19)

Attempting to parse a url like this
http://example.com/entities/GOA:98/?search=8989157d1f22
Correctly produces
<?php array (   'scheme' => 'http',   'host' => 'example.com',   'path' => '/entities/GOA:98/',   'query' => 'search=8989157d1f22', ); ?>

However, Attempting to parse the relative URL
entities/GOA:98/?search=8989157d1f22
<?php array (   'host' => 'entities',   'port' => 98,   'path' => '/GOA:98/',   'query' => 'search=8989157d1f22', ) ?>
If I change :98 to :A98 parse_url parses the URL correctly as
<?php array (   'path' => 'entities/GOA:A98/',   'query' => 'search=8989157d1f22', ) ?>
Bottom line, Avoid using parse_url for relative urls unless you have tested the expected input and you know parse_url will handle them well.

[#2] Rob [2015-04-21 12:27:42]

I've been working on a generic class that would make URI parsing / building a little easier.

The composer package is here: https://packagist.org/packages/enrise/urihelper

And the repository is here: https://github.com/Enrise/UriHelper

An example of the usage:

<?php $uri = new \Enrise\Uri('http://usr:pss@example.com:81/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment'); echo $uri->getScheme(); // http echo $uri->getUser(); // usr echo $uri->getPass(); // pss echo $uri->getHost(); // example.com echo $uri->getPort(); // 81 echo $uri->getPath(); // /mypath/myfile.html echo $uri->getQuery(); // a=b&b[]=2&b[]=3 echo $uri->getFragment(); // myfragment echo $uri->isSchemeless(); // false echo $uri->isRelative(); // false $uri->setScheme('scheme:child:scheme.VALIDscheme123:'); $uri->setPort(null); echo $uri->getUri(); //scheme:child:scheme.VALIDscheme123:usr:pss@example.com/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment ?>

[#3] jerome at chaman dot ca [2015-01-16 22:53:16]

It may be worth reminding that the value of the #fragment never gets sent to the server. Anchors processing is exclusively client-side.

[#4] admin at griefer1999 dot uhostfull dot com [2015-01-06 06:46:21]

<?php function url_parse($url){ $sflfdfldf=$url; if(strpos($url,"?")>-1){ $a=explode("?",$url,2); $url=$a[0]; $query=$a[1]; } if(strpos($url,"://")>-1){ $scheme=substr($url,0,strpos($url,"//")-1); $url=substr($url,strpos($url,"//")+2,strlen($url)); } if(strpos($url,"/")>-1){ $a=explode("/",$url,2); $url=$a[0]; $path="/".$a[1]; } if(strpos($url,":")>-1){ $a=explode(":",$url,2); $url=$a[0]; $port=$a[1]; } $host=$url; $url=null; foreach(array("url","scheme","host","port","path","query") as $var){ if(!empty($$var)){ $return[$var]=$$var; } } //return array("url"=>$sflfdfldf,"scheme"=>$scheme,"host"=>$host,"port"=>$port,"path"=>$path,"query"=>$query,"a"=>$url); return $return; } ?>

<?php //mine print_r(url_parse("http://login.yahoo.com?.src=ym&.intl=gb&.lang=zh-Hans-HK&.done=https://mail.yahoo.com")); //internal print_r(parse_url("http://login.yahoo.com?.src=ym&.intl=gb&.lang=zh-Hans-HK&.done=https://mail.yahoo.com")); ?>

[#5] php at domblogger dot net [2014-11-14 23:26:26]

At least in php 5.6.x this function does appear to work with relative URLs despite what it says above.

Obviously it does not return the scheme or host, but it does return the path and query string and fragment from a relative URL.

[#6] lauris () lauris ! lv [2014-04-09 08:49:44]

Here is utf-8 compatible parse_url() replacement function based on "laszlo dot janszky at gmail dot com" work. Original incorrectly handled URLs with user:pass. Also made PHP 5.5 compatible (got rid of now deprecated regex /e modifier).

<?php function mb_parse_url($url) { $enc_url = preg_replace_callback( '%[^:/@?&=#]+%usD', function ($matches) { return urlencode($matches[0]); }, $url ); $parts = parse_url($enc_url); if($parts === false) { throw new \InvalidArgumentException('Malformed URL: ' . $url); } foreach($parts as $name => $value) { $parts[$name] = urldecode($value); } return $parts; } ?>

[#7] ivijan dot stefan at gmail dot com [2014-03-26 16:49:57]

Here's a good way to using parse_url () gets the youtube link.
This function I used in many works:

<?php function youtube($url, $width=560, $height=315, $fullscreen=true) { parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars ); $youtube= '<iframe allowtransparency="true" scrolling="no" width="'.$width.'" height="'.$height.'" src="//www.youtube.com/embed/'.$my_array_of_vars['v'].'" frameborder="0"'.($fullscreen?' allowfullscreen':NULL).'></iframe>'; return $youtube; } // show youtube on my page $url='http://www.youtube.com/watch?v=yvTd6XxgCBE'; youtube($url, 560, 315, true); ?>

parse_url () allocates a unique youtube code and put into iframe link and displayed on your page. The size of the videos choose yourself.

Enjoy.

[#8] webmaster at bigbirdmedia dot com [2014-02-05 16:56:10]

A simple function using "parse_url" to find the base URL of the given link.

<?php function getPrimaryDomain($url) { $tld = parse_url($url,PHP_URL_HOST); $tldArray = explode(".",$tld); // COUNTS THE POSITION IN THE ARRAY TO IDENTIFY THE TOP LEVEL DOMAIN (TLD) $l1 = '0'; foreach($tldArray as $s) { // CHECKS THE POSITION IN THE ARRAY TO SEE IF IT MATCHES ANY OF THE KNOWN TOP LEVEL DOMAINS (YOU CAN ADD TO THIS LIST) if($s == 'com' || $s == 'net' || $s == 'info' || $s == 'biz' || $s == 'us' || $s == 'co' || $s == 'org' || $s == 'me') { // CALCULATES THE SECOND LEVEL DOMAIN POSITION IN THE ARRAY ONCE THE POSITION OF THE TOP LEVEL DOMAIN IS IDENTIFIED $l2 = $l1 - 1; } else { // INCREMENTS THE COUNTER FOR THE TOP LEVEL DOMAIN POSITION IF NO MATCH IS FOUND $l1++; } } // RETURN THE SECOND LEVEL DOMAIN AND THE TOP LEVEL DOMAIN IN THE FORMAT LIKE "SOMEDOMAIN.COM" echo $tldArray[$l2] . '.' . $tldArray[$l1]; } // CALL THE FUNCTION - THIS EXAMPLE RETURNS "BITLY.COM" getPrimaryDomain('http://www.enterprise.bitly.com/?utm_source=homepage); ?>

[#9] utilmind [2013-07-01 00:06:04]

parse_url doesn't works if the protocol doesn't specified. This seems like sandard, even the youtube doesn't gives the protocol name when generates code for embedding which have a look like "//youtube.com/etc".

So, to avoid bug, you must always check, whether the provided url has the protocol, and if not (starts with 2 slashes) -- add the "http:" prefix.

[#10] laszlo dot janszky at gmail dot com [2012-05-24 20:20:13]

Created another parse_url utf-8 compatible function.
<?php function mb_parse_url($url) { $encodedUrl = preg_replace('%[^:/?#&=\.]+%usDe', 'urlencode(\'$0\')', $url); $components = parse_url($encodedUrl); foreach ($components as &$component) $component = urldecode($component); return $components; } ?>

[#11] therselman at gmail [2012-01-28 01:03:41]

UTF-8 aware parse_url() replacement.

I've realized that even though UTF-8 characters are not allowed in URL's, I have to work with a lot of them and parse_url() will break.

Based largely on the work of "mallluhuct at gmail dot com", I added parse_url() compatible "named values" which makes the array values a lot easier to work with (instead of just numbers). I also implemented detection of port, username/password and a back-reference to better detect URL's like this: //en.wikipedia.com
... which, although is technically an invalid URL, it's used extensively on sites like wikipedia in the href of anchor tags where it's valid in browsers (one of the types of URL's you have to support when crawling pages). This will be accurately detected as the host name instead of "path" as in all other examples.

I will submit my complete function (instead of just the RegExp) which is an almost "drop-in" replacement for parse_url(). It returns a cleaned up array (or false) with values compatible with parse_url(). I could have told the preg_match() not to store the unused extra values, but it would complicate the RegExp and make it more difficult to read, understand and extend. The key to detecting UTF-8 characters is the use of the "u" parameter in preg_match().

<?php function parse_utf8_url($url) { static $keys = array('scheme'=>0,'user'=>0,'pass'=>0,'host'=>0,'port'=>0,'path'=>0,'query'=>0,'fragment'=>0); if (is_string($url) && preg_match( '~^((?P<scheme>[^:/?#]+):(//))?((\\3|//)?(?:(?P<user>[^:]+):(?P<pass>[^@]+)@)?(?P<host>[^/?:#]*))(:(?P<port>\\d+))?' . '(?P<path>[^?#]*)(\\?(?P<query>[^#]*))?(#(?P<fragment>.*))?~u', $url, $matches)) { foreach ($matches as $key => $value) if (!isset($keys[$key]) || empty($value)) unset($matches[$key]); return $matches; } return false; } ?>

UTF-8 URL's can/should be "normalized" after extraction with this function.

[#12] thomas at gielfeldt dot com [2011-12-02 02:50:47]

[If you haven't yet] been able to find a simple conversion back to string from a parsed url, here's an example:

<?php $url = 'http://usr:pss@example.com:81/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment'; if ($url === unparse_url(parse_url($url))) { print "YES, they match!\n"; } function unparse_url($parsed_url) { $scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : ''; $host = isset($parsed_url['host']) ? $parsed_url['host'] : ''; $port = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : ''; $user = isset($parsed_url['user']) ? $parsed_url['user'] : ''; $pass = isset($parsed_url['pass']) ? ':' . $parsed_url['pass'] : ''; $pass = ($user || $pass) ? "$pass@" : ''; $path = isset($parsed_url['path']) ? $parsed_url['path'] : ''; $query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : ''; $fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : ''; return "$scheme$user$pass$host$port$path$query$fragment"; } ?>

[#13] gustavo dot andriuolo at vulcabras dot com dot ar [2011-07-12 18:31:30]

Here's a method to get the REAL name of a domain. This return just the domain name, not the rest. First check if is not an IP, then return the name:

<?php function esip($ip_addr) { //first of all the format of the ip address is matched if(preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/",$ip_addr)) { //now all the intger values are separated $parts=explode(".",$ip_addr); //now we need to check each part can range from 0-255 foreach($parts as $ip_parts) { if(intval($ip_parts)>255 || intval($ip_parts)<0) return FALSE; //if number is not within range of 0-255 } return TRUE; } else return FALSE; //if format of ip address doesn't matches } function domain($domainb) { $bits = explode('/', $domainb); if ($bits[0]=='http:' || $bits[0]=='https:') { $domainb= $bits[2]; } else { $domainb= $bits[0]; } unset($bits); $bits = explode('.', $domainb); $idz=count($bits); $idz-=3; if (strlen($bits[($idz+2)])==2) { $url=$bits[$idz].'.'.$bits[($idz+1)].'.'.$bits[($idz+2)]; } else if (strlen($bits[($idz+2)])==0) { $url=$bits[($idz)].'.'.$bits[($idz+1)]; } else { $url=$bits[($idz+1)].'.'.$bits[($idz+2)]; } return $url; } $address='clients1.sub3.google.co.uk'; $parsed_url = parse_url($address); $check = esip($parsed_url['host']); $host = $parsed_url['host']; if ($check == FALSE){ if ($host != ""){ $host = domain($host); }else{ $host = domain($address); } } echo $host; ?>
This return: google.co.uk
'http://sub1.sub2.sub3.example.com:443';
return: example.com
'example.com';
return: example.com

Many times parse_url return nothing when domain is google.com only for example.

Now, google.com, or google.co.uk will return the same.

Maybe is a little dirty, but works well for me, i use it to group internet access log from squid.

Regards.

[#14] Simon D [2011-06-21 06:45:34]

To get the params (url query) as Associative array, use this function:

<?php function convertUrlQuery($query) { $queryParts = explode('&', $query); $params = array(); foreach ($queryParts as $param) { $item = explode('=', $param); $params[$item[0]] = $item[1]; } return $params; } ?>

[#15] Egor Chernodarov [2011-04-06 01:34:52]

Noticed the following differences in error handling:

<?php     print_r(parse_url('ftp://user:password@host:port')); ?>

In PHP 5.2.6 returns:
Array
(
    [scheme] => ftp
    [host] => host
    [user] => user
    [pass] => password
)

port is just skipped.

But in PHP 5.3.6 returns NULL without any warnings.

[#16] bahtiar at gadimov dot de [2010-12-16 05:38:47]

Hi,

if you have problems with UTF8 encoded urls please see http://bugs.php.net/bug.php?id=52923 . parse_url breaks the utf8. :( You have to implement it yourself.

[#17] Mark Dobrinic [2010-12-10 02:55:44]

It seems the host-part strips off the last [:port] off the end of the hostname

When something is wrong in the actual request, this proves to be the wrong way to do things.

It would be better to not strip off the [:port], but to keep the string *before* the first [:port] as the hostname.

Problem with (maybe malformed) provided HTTP_HOST
hostname:443:443
that resolved in
'host' => 'hostname:443'

Which gave me problems.

Solution would be to enforce this yourself, explicitly:

<?php $p = parse_url( $url ); $host = explode(':', $p['host']); $hostname = $host[0]; ?>

[#18] jesse at example dot com [2010-09-25 19:48:48]

@ solenoid: Your code was very helpful, but it fails when the current URL has no query string (it appends '&' instead of '?' before the query). Below is a fixed version that catches this edge case and corrects it.

<?php function modify_url($mod) { $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; $query = explode("&", $_SERVER['QUERY_STRING']); if (!$_SERVER['QUERY_STRING']) {$queryStart = "?";} else {$queryStart = "&";} // modify/delete data foreach($query as $q) { list($key, $value) = explode("=", $q); if(array_key_exists($key, $mod)) { if($mod[$key]) { $url = preg_replace('/'.$key.'='.$value.'/', $key.'='.$mod[$key], $url); } else { $url = preg_replace('/&?'.$key.'='.$value.'/', '', $url); } } } // add new data foreach($mod as $key => $value) { if($value && !preg_match('/'.$key.'=/', $url)) { $url .= $queryStart.$key.'='.$value; } } return $url; } ?>

[#19] martin at planio dot com [2010-09-17 07:02:51]

For those of you sending URLs in HTML emails with a redirect address in the query string, note that Hotmail unescapes / and : characters in the query string. So that breaks the parse_url() function call. Take this as an example:
href="http://example.com/redirect?url=http%3A%2F%2Fplanio.com"
Hotmail will transform it to this:
href="http://example.com/redirect?url=http://planio.com"

The solution is to be preventive before the call to parse_url():
<?php $q_index = strpos($uri, '?'); if ($q_index !== FALSE && (strpos($uri, ':', $q_index) !== FALSE || strpos($uri, '/', $q_index) !== FALSE)) { $begin = substr($uri, 0, $q_index); $end = substr($uri, $q_index, strlen($uri)-$q_index); $end = str_replace('/', '%2F', $end); $end = str_replace(':', '%3A', $end); $uri = $begin.$end; } ?>

[#20] przemek at sobstel dot org [2010-08-19 13:44:07]

If you want to get host, function will return NULL if you pass only host.

Example:

<?php parse_url($url, PHP_URL_HOST); ?>

$url => value returned

http://example.com => string 'example.com' (length=11)
http://www.example.com =>string 'www.example.com' (length=15)
http://www.example.com:8080 => string 'www.example.com' (length=15)
example.com => null
www.example.com => null
example.com:8080 => string 'example.com' (length=11)
www.example.com:8080 => string 'www.example.com' (length=15)

[#21] solenoid at example dot com [2010-04-22 16:05:14]

Here's a piece of code that modifies, replaces or removes the url query. This can typically used in paging situations where there are more parameters than the page.

<?php function modify_url($mod) { $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; $query = explode("&", $_SERVER['QUERY_STRING']); // modify/delete data foreach($query as $q) { list($key, $value) = explode("=", $q); if(array_key_exists($key, $mod)) { if($mod[$key]) { $url = preg_replace('/'.$key.'='.$value.'/', $key.'='.$mod[$key], $url); } else { $url = preg_replace('/&?'.$key.'='.$value.'/', '', $url); } } } // add new data foreach($mod as $key => $value) { if($value && !preg_match('/'.$key.'=/', $url)) { $url .= '&'.$key.'='.$value; } } return $url; } // page url: "http://www.example.com/page.php?p=5&show=list&style=23" $url = modify_url(array('p' => 4, 'show' => 'column')); // $url = "http://www.example.com/page.php?p=4&show=column&style=23" ?>

[#22] james at roundeights dot com [2010-02-26 11:24:33]

I was writing unit tests and needed to cause this function to kick out an error and return FALSE in order to test a specific execution path. If anyone else needs to force a failure, the following inputs will work:

<?php parse_url("http:///example.com"); parse_url("http://:80"); parse_url("http://user@:80"); ?>

[#23] need_sunny at yahoo dot com [2009-12-25 05:57:02]

Thanks to xellisx for his parse_query function. I used it in one of my projects and it works well. But it has an error. I fixed the error and improved it a little bit. Here is my version of it:

<?php // Originally written by xellisx function parse_query($var) { $var = parse_url($var, PHP_URL_QUERY); $var = html_entity_decode($var); $var = explode('&', $var); $arr = array(); foreach($var as $val) { $x = explode('=', $val); $arr[$x[0]] = $x[1]; } unset($val, $x, $var); return $arr; } ?>

At the first line there was parse_query($val), I made it $var. It used to return a null array before this fix.

I have added the parse_url line. So now the function will only focus in the query part, not the whole URL. This is useful if something like below is done:
<?php $my_GET = parse_query($_SERVER['REQUEST_URI']); ?>

[#24] nirazuelos at gmail dot com [2009-10-09 14:45:45]

Hello, for some odd reason, parse_url returns the host (ex. example.com) as the path when no scheme is provided in the input url. So I've written a quick function to get the real host:

<?php function getHost($Address) { $parseUrl = parse_url(trim($Address)); return trim($parseUrl[host] ? $parseUrl[host] : array_shift(explode('/', $parseUrl[path], 2))); } getHost("example.com"); // Gives example.com getHost("http://example.com"); // Gives example.com getHost("www.example.com"); // Gives www.example.com getHost("http://example.com/xyz"); // Gives example.com ?>

You could try anything! It gives the host (including the subdomain if exists).

Hope it helped you.

[#25] ap dot public1 at gmail dot com [2009-07-14 20:36:56]

Simple static library that allows easy manipulation of url parameters:

<?php class Url { public static function explode($sUrl) { $aUrl = parse_url($sUrl); $aUrl['query_params'] = array(); $aPairs = explode('&', $aUrl['query']); DU::show($aPairs); foreach($aPairs as $sPair) { if (trim($sPair) == '') { continue; } list($sKey, $sValue) = explode('=', $sPair); $aUrl['query_params'][$sKey] = urldecode($sValue); } return $aUrl; } public static function implode($aUrl) { //[scheme]://[user]:[pass]@[host]/[path]?[query]#[fragment] $sQuery = ''; // Compile query if (isset($aUrl['query_params']) && is_array($aUrl['query_params'])) { $aPairs = array(); foreach ($aUrl['query_params'] as $sKey=>$sValue) { $aPairs[] = $sKey.'='.urlencode($sValue); } $sQuery = implode('&', $aPairs); } else { $sQuery = $aUrl['query']; } // Compile url $sUrl = $aUrl['scheme'] . '://' . ( isset($aUrl['user']) && $aUrl['user'] != '' && isset($aUrl['pass']) ? $aUrl['user'] . ':' . $aUrl['pass'] . '@' : '' ) . $aUrl['host'] . ( isset($aUrl['path']) && $aUrl['path'] != '' ? $aUrl['path'] : '' ) . ( $sQuery != '' ? '?' . $sQuery : '' ) . ( isset($aUrl['fragment']) && $aUrl['fragment'] != '' ? '#' . $aUrl['fragment'] : '' ); return $sUrl; } public static function getParams($sUrl) { $aUrl = self::explode($sUrl); return $aUrl['query_params']; } public static function setParams($sUrl, $aParams) { $aUrl = self::explode($sUrl); $aUrl['query'] = ''; $aUrl['query_params'] = $aParams; return self::implode($aUrl); } public static function updateParams($sUrl, $aParams) { $aUrl = self::explode($sUrl); $aUrl['query'] = ''; $aUrl['query_params'] = array_merge($aUrl['query_params'], $aParams); return self::implode($aUrl); } } ?>

[#26] theoriginalmarksimpson at gmail dot com [2009-04-17 17:08:49]

An update to the function by FredLudd at gmail dot com.  I added IPv6 functionality as well.

<?php function j_parseUrl($url) {   $r  = "(?:([a-z0-9+-._]+)://)?";   $r .= "(?:";   $r .=   "(?:((?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9a-f]{2})*)@)?";   $r .=   "(?:\[((?:[a-z0-9:])*)\])?";   $r .=   "((?:[a-z0-9-._~!$&'()*+,;=]|%[0-9a-f]{2})*)";   $r .=   "(?::(\d*))?";   $r .=   "(/(?:[a-z0-9-._~!$&'()*+,;=:@/]|%[0-9a-f]{2})*)?";   $r .=   "|";   $r .=   "(/?";   $r .=     "(?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+";   $r .=     "(?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9a-f]{2})*";   $r .=    ")?";   $r .= ")";   $r .= "(?:\?((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9a-f]{2})*))?";   $r .= "(?:#((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9a-f]{2})*))?";   preg_match("`$r`i", $url, $match);   $parts = array(             "scheme"=>'',             "userinfo"=>'',             "authority"=>'',             "host"=> '',             "port"=>'',             "path"=>'',             "query"=>'',             "fragment"=>'');   switch (count ($match)) {     case 10: $parts['fragment'] = $match[9];     case 9: $parts['query'] = $match[8];     case 8: $parts['path'] =  $match[7];     case 7: $parts['path'] =  $match[6] . $parts['path'];     case 6: $parts['port'] =  $match[5];     case 5: $parts['host'] =  $match[3]?"[".$match[3]."]":$match[4];     case 4: $parts['userinfo'] =  $match[2];     case 3: $parts['scheme'] =  $match[1];   }   $parts['authority'] = ($parts['userinfo']?$parts['userinfo']."@":"").                          $parts['host'].                         ($parts['port']?":".$parts['port']:"");   return $parts; } ?>

When using the url


  "foo://username:password@[2001:4860:0:2001::68]:8042".
      "/over/there/index.dtb;type=animal?name=ferret#nose"

The original would return

Array
(
    [scheme] => foo
    [userinfo] => username:password
    [authority] => username:password@
    [host] =>
    [port] =>
    [path] =>
    [query] =>
    [fragment] =>
)

The new one returns

Array
(
    [scheme] => foo
    [userinfo] => username:password
    [authority] => username:password@[2001:4860:0:2001::68]:8042
    [host] => [2001:4860:0:2001::68]
    [port] => 8042
    [path] => /over/there/index.dtb;type=animal
    [query] => name=ferret
    [fragment] => nose
)

All of the other examples FredLudd used below still work exactly the same.

[#27] pbcomm at gmail dot com [2008-10-25 21:55:17]

Modification to the code from:
theoriginalmarksimpson at gmail dot com

Change:
$r .= "(?:(?P<login>\w+):(?P<pass>\w+)@)?";

Replace with:
$r .= "(?:(?P<login>\w+):?(?P<pass>\w+)?@)?";

This will cover the case the only username is present in the url:

http://username@subdomain.domain.com/index.php?arg1=test#anchor

[#28] vdklah at hotmail dot com [2008-10-17 02:53:54]

Some example that determines the URL port.
When port not specified, it derives it from the scheme.

<?php function getUrlPort( $urlInfo ) { if( isset($urlInfo['port']) ) { $port = $urlInfo['port']; } else { // no port specified; get default port if (isset($urlInfo['scheme']) ) { switch( $urlInfo['scheme'] ) { case 'http': $port = 80; // default for http break; case 'https': $port = 443; // default for https break; case 'ftp': $port = 21; // default for ftp break; case 'ftps': $port = 990; // default for ftps break; default: $port = 0; // error; unsupported scheme break; } } else { $port = 0; // error; unknown scheme } } return $port; } $url = "http://nl3.php.net/manual/en/function.parse-url.php"; $urlInfo = parse_url( $url ); $urlPort = getUrlPort( $urlInfo ); if( $urlPort !== 0 ) { print 'Found URL port: '.$urlPort; } else { print 'ERROR: Could not find port at URL: '.$url; } ?>

[#29] gautam at rogers dot com [2008-10-15 11:08:46]

What about using something like this to safely encoding all the values that are passed in the query portion?

Example input:
http://www.example.com/?first=john&last=smith&email=john@smith.com

Result:
http://www.example.com/?first=john&last=smith&email=john%40smith.com

<?php function safe_url($url) { // Make sure we have a string to work with if(!empty($url)) { // Explode into URL keys $urllist=parse_url($url); // Make sure we have a valid result set and a query field if(is_array($urllist) && isset($urllist["query"])) { // Explode into key/value array $keyvalue_list=explode("&",($urllist["query"])); // Store resulting key/value pairs $keyvalue_result=array(); foreach($keyvalue_list as $key=>$value) { // Explode each individual key/value into an array $keyvalue=explode("=",$value); // Make sure we have a "key=value" array if(count($keyvalue)==2) { // Encode the value portion $keyvalue[1]=urlencode($keyvalue[1]); // Add our key and encoded value into the result array_push($keyvalue_result,implode("=",$keyvalue)); } } // Repopulate our query key with encoded results $urllist["query"]=implode("&",$keyvalue_result); // Build the the final output URL $url=(isset($urllist["scheme"])?$urllist["scheme"]."://":""). (isset($urllist["user"])?$urllist["user"].":":""). (isset($urllist["pass"])?$urllist["pass"]."@":""). (isset($urllist["host"])?$urllist["host"]:""). (isset($urllist["port"])?":".$urllist["port"]:""). (isset($urllist["path"])?$urllist["path"]:""). (isset($urllist["query"])?"?".$urllist["query"]:""). (isset($urllist["fragment"])?"#".$urllist["fragment"]:""); } } return $url; } ?>

[#30] FredLudd at gmail dot com [2008-10-03 11:24:42]

Another shot at trying to find a better parser. I noticed that the laulibrius/theoriginalmarksimpson functions didn't quite handle the URL for the page they were displayed on. For my mirror, ca3, this is
  http://ca3.php.net/manual/en/function.parse-url.php

Run it through the function and it parses to
  scheme => http
  login =>
  pass =>
  host => ca3.php.net
  ip =>
  subdomain => ca3
  domain => php.
  extension => net
  port =>
  path => /manual/en/function.parse
  file => function.parse
that is, the file name gets a bit mangled

Rather than tweak the function's regular expression yet again, I opted to adapt a RegExp that served me well in Javascript:

function j_parseUrl($url) {
  $r  = "(?:([a-z0-9+-._]+)://)?";
  $r .= "(?:";
  $r .=   "(?:((?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9a-f]{2})*)@)?";
  $r .=   "((?:[a-z0-9-._~!$&'()*+,;=]|%[0-9a-f]{2})*)";
  $r .=   "(?::(\d*))?";
  $r .=   "(/(?:[a-z0-9-._~!$&'()*+,;=:@/]|%[0-9a-f]{2})*)?";
  $r .=   "|";
  $r .=   "(/?";
  $r .=     "(?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+";
  $r .=     "(?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9a-f]{2})*";
  $r .=    ")?";
  $r .= ")";
  $r .= "(?:\?((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9a-f]{2})*))?";
  $r .= "(?:#((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9a-f]{2})*))?";
  preg_match("`$r`i", $url, $match);
  $parts = array(
            "scheme"=>'',
            "userinfo"=>'',
            "authority"=>'',
            "host"=> '',
            "port"=>'',
            "path"=>'',
            "query"=>'',
            "fragment"=>'');
  switch (count ($match)) {
    case 9: $parts['fragment'] = $match[8];
    case 8: $parts['query'] = $match[7];
    case 7: $parts['path'] =  $match[6];
    case 6: $parts['path'] =  $match[5] . $parts['path'];
    case 5: $parts['port'] =  $match[4];
    case 4: $parts['host'] =  $match[3];
    case 3: $parts['userinfo'] =  $match[2];
    case 2: $parts['scheme'] =  $match[1];
  }
  $parts['authority'] = ($parts['userinfo']?$parts['userinfo']."@":"").
                         $parts['host'].
                        ($parts['port']?":".$parts['port']:"");
  return $parts;
}

This function, when fed "http://ca3.php.net/manual/en/function.parse-url.php", returns
  scheme => http
  userinfo =>
  authority => ca3.php.net
  host => ca3.php.net
  port =>
  path => /manual/en/function.parse-url.php
  query =>
  fragment =>
which is somewhat closer to my needs.

But everything should be tested against the two examples provided by RFC3986,


  "foo://username:password@example.com:8042".
      "/over/there/index.dtb;type=animal?name=ferret#nose"
and
  "urn:example:animal:ferret:nose"

Here the native function parse_url() performs admirably on that "urn:" example. Mine fails to pick out the path ("example:animal:ferret:nose") and the laulibrius/theoriginalmarksimpson function can't decipher anything there. On the "foo:" example, both my function and parse_url() get it right, while the other examples on this page don't.

The laulibrius/theoriginalmarksimpson function delivers
  scheme => foo
  login => username
  pass => password
  host => example.com
  ip =>
  subdomain =>
  domain => example.
  extension => com
  port => 8042
  path => /over/there/index.dtb
  file => index.dtb

As you can see, the query string ("name=ferret") and fragment ("nose") have dropped off, as well as the parameter ("type=animal").

[#31] xellisx [2008-10-01 08:37:42]

I need to parse out the query string from the referrer, so I created this function.

<?php function parse_query($val) { $var = html_entity_decode($var); $var = explode('&', $var); $arr = array(); foreach($var as $val) { $x = explode('=', $val); $arr[$x[0]] = $x[1]; } unset($val, $x, $var); return $arr; } ?>

[#32] ilja at radusch dot com [2008-09-26 04:26:50]

Here is an update to the glue_url() function.

It can now handle relative URLs if only 'path' is provided.

<?php function glue_url($parsed) { if (!is_array($parsed)) { return false; } $uri = isset($parsed['scheme']) ? $parsed['scheme'].':'.((strtolower($parsed['scheme']) == 'mailto') ? '' : '//') : ''; $uri .= isset($parsed['user']) ? $parsed['user'].(isset($parsed['pass']) ? ':'.$parsed['pass'] : '').'@' : ''; $uri .= isset($parsed['host']) ? $parsed['host'] : ''; $uri .= isset($parsed['port']) ? ':'.$parsed['port'] : ''; if (isset($parsed['path'])) { $uri .= (substr($parsed['path'], 0, 1) == '/') ? $parsed['path'] : ((!empty($uri) ? '/' : '' ) . $parsed['path']); } $uri .= isset($parsed['query']) ? '?'.$parsed['query'] : ''; $uri .= isset($parsed['fragment']) ? '#'.$parsed['fragment'] : ''; return $uri; } ?>

[#33] nospam at spellingcow dot com [2008-09-08 14:03:58]

URL's in the query string of a relative URL will cause a problem

fails:
/page.php?foo=bar&url=http://www.example.com

parses:
http://www.foo.com/page.php?foo=bar&url=http://www.example.com

[#34] marco panichi [2008-08-23 01:47:18]

my function catch the url written on the browser by the user and does the same thing of parse_url. but better, I think. I don't like parse_url because it says nothing about elements that it doesn't find in the url. my function instead return an empty string.

<?php function get_url() { $arr = array(); $uri = $_SERVER['REQUEST_URI']; // query $x = array_pad( explode( '?', $uri ), 2, false ); $arr['query'] = ( $x[1] )? $x[1] : '' ; // resource $x = array_pad( explode( '/', $x[0] ), 2, false ); $x_last = array_pop( $x ); if( strpos( $x_last, '.' ) === false ) { $arr['resource'] = ''; $x[] = $x_last; } else { $arr['resource'] = $x_last; } // path $arr['path'] = implode( '/', $x ); if( substr( $arr['path'], -1 ) !== '/' ) $arr['path'] .= '/'; // domain $arr['domain'] = $_SERVER['SERVER_NAME']; // scheme $server_prt = explode( '/', $_SERVER['SERVER_PROTOCOL'] ); $arr['scheme'] = strtolower( $server_prt[0] ); // url $arr['url'] = $arr['scheme'].'://'.$arr['domain'].$uri; return $arr; } ?>

PS: I found working with explode is faster than using preg_match (I tryed with getmicrotime function and 'for' cycles).

PPS: I used array_pad to prevent any notice.

[#35] andrewtheartist at hotmail dot com [2008-06-28 17:28:58]

Here's the easiest way to get the URL to the path that your script is in (so not the actual script name itself, just the complete URL to the folder it's in)

echo "http://".$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);

[#36] Cool Coyote [2008-06-23 05:35:22]

based on the "laulibrius at hotmail dot com" function, this work for relatives url only:

<?php function parseUrl($url) { $r = "^(?:(?P<path>[\.\w/]*/)?"; $r .= "(?P<file>\w+(?:\.\w+)?)?)\.(?P<extension>\w+)?"; $r .= "(?:\?(?P<arg>[\w=&]+))?"; $r .= "(?:#(?P<anchor>\w+))?"; $r = "!$r!"; preg_match ( $r, $url, $out ); return $out; } print_r(parseUrl("../test/f.aq.php?p=1&v=blabla#X1")); ?>

returns:
Array
(
    [0] => ../test/faq.php?p=1&v=blabla#X1
    [path] => ../test/
    [1] => ../test/
    [file] => faq
    [2] => faq
    [extension] => php
    [3] => php
    [arg] => p=1&v=blabla
    [4] => p=1&v=blabla
    [anchor] => X1
    [5] => X1
)

[#37] laulibrius at hotmail dot com [2008-06-16 09:31:48]

There was one thing missing in the function dropped by "to1ne at hotmail dot com" when i tried it : domain and subdomain couldn't have a dash "-". So i add it in the regexp and the function looks like this now :

<?php function parseUrl($url) { $r = "^(?:(?P<scheme>\w+)://)?"; $r .= "(?:(?P<login>\w+):(?P<pass>\w+)@)?"; $r .= "(?P<host>(?:(?P<subdomain>[-\w\.]+)\.)?" . "(?P<domain>[-\w]+\.(?P<extension>\w+)))"; $r .= "(?::(?P<port>\d+))?"; $r .= "(?P<path>[\w/]*/(?P<file>\w+(?:\.\w+)?)?)?"; $r .= "(?:\?(?P<arg>[\w=&]+))?"; $r .= "(?:#(?P<anchor>\w+))?"; $r = "!$r!"; // Delimiters preg_match ( $r, $url, $out ); return $out; } ?>

Btw, thanks for the function, it helps me a lot.

[#38] to1ne at hotmail dot com [2008-06-13 11:01:45]

Based on the idea of "jbr at ya-right dot com" have I been working on a new function to parse the url:

<?php function parseUrl($url) {     $r  = "^(?:(?P<scheme>\w+)://)?";     $r .= "(?:(?P<login>\w+):(?P<pass>\w+)@)?";     $r .= "(?P<host>(?:(?P<subdomain>[\w\.]+)\.)?" . "(?P<domain>\w+\.(?P<extension>\w+)))";     $r .= "(?::(?P<port>\d+))?";     $r .= "(?P<path>[\w/]*/(?P<file>\w+(?:\.\w+)?)?)?";     $r .= "(?:\?(?P<arg>[\w=&]+))?";     $r .= "(?:#(?P<anchor>\w+))?";     $r = "!$r!";                                                // Delimiters          preg_match ( $r, $url, $out );          return $out; } print_r ( parseUrl ( 'me:you@sub.site.org:29000/pear/validate.html?happy=me&sad=you#url' ) ); ?>

This returns:
Array
(
    [0] => me:you@sub.site.org:29000/pear/validate.html?happy=me&sad=you#url
    [scheme] =>
    [1] =>
    [login] => me
    [2] => me
    [pass] => you
    [3] => you
    [host] => sub.site.org
    [4] => sub.site.org
    [subdomain] => sub
    [5] => sub
    [domain] => site.org
    [6] => site.org
    [extension] => org
    [7] => org
    [port] => 29000
    [8] => 29000
    [path] => /pear/validate.html
    [9] => /pear/validate.html
    [file] => validate.html
    [10] => validate.html
    [arg] => happy=me&sad=you
    [11] => happy=me&sad=you
    [anchor] => url
    [12] => url
)

So both named and numbered array keys are possible.

It's quite advanced, but I think it works in any case... Let me know if it doesn't...

[#39] jbr at ya-right dot com [2008-05-02 20:24:27]

This function never works the way you think it should...

Example....

<?php print_r ( parse_url ( 'me:you@sub.site.org/pear/validate.html?happy=me&sad=you#url' ) ); ?>

Returns...

Array
(
    [scheme] => me
    [path] => you@sub.site.org/pear/validate.html
    [query] => happy=me&sad=you
    [fragment] => url
)

Here my way of doing parse_url

<?php function parseUrl ( $url ) {     $r  = '!(?:(\w+)://)?(?:(\w+)\:(\w+)@)?([^/:]+)?';     $r .= '(?:\:(\d*))?([^#?]+)?(?:\?([^#]+))?(?:#(.+$))?!i';     preg_match ( $r, $url, $out );     return $out; } print_r ( parseUrl ( 'me:you@sub.site.org/pear/validate.html?happy=me&sad=you#url' ) ); ?>

Returns...

Array
(
    [0] => me:you@sub.site.org/pear/validate.html?happy=me&sad=you#url
    [1] =>
    [2] => me
    [3] => you
    [4] => sub.site.org
    [5] =>
    [6] => /pear/validate.html
    [7] => happy=me&sad=you
    [8] => url
)

Where as...

out[0] = full url
out[1] = scheme or '' if no scheme was found
out[2] = username or '' if no auth username was found
out[3] = password or '' if no auth password was found
out[4] = domain name or '' if no domain name was found
out[5] = port number or '' if no port number was found
out[6] = path or '' if no path was found
out[7] = query or '' if no query was found
out[8] = fragment or '' if no fragment was found

[#40] Nicolas Merlet - admin(at)merletn.org [2008-03-14 07:05:24]

Please note that parse_url seems not to produce always the same results when passing non-standard urls.

Eg. I was using this code since 2005 (both under PHP 4.3.10 and PHP 5.2.3) :

<?php $p = parse_url ( 'http://domain.tld/tcp://domain2.tld/dir/file' ) ; $d2 = parse_url ( $p['path'] ) ; echo $d2 ; // returns '/dir/file' ?>

Of course my example is very specific, as URL is not really correct. But using parse_url was a great trick to split URL easily (without using regular expressions).

Unfortunately under PHP 5.2.0-8 (+etch10), parse_url will fail as it does not accept the slash (/) at the beginning of URL.

Here is a possible patch :

<?php $p = parse_url ( 'http://domain.tld/tcp://domain2.tld/dir/file' ) ; $d2 = parse_url ( substr ( $p['path'] , 1 ) ) ; echo $d2 ; // returns '/dir/file' ?>

However this last code is not optimized at all, and should be replaced by a regular expression to split URL (so that parse_url would be no longer used).

So you should use parse_url very carefully, and verify that you pass only standard URLs...

[#41] Nick Smith [2007-09-05 02:32:28]

Note that older versions of PHP (e.g., 4.1) returned an blank string as the path for URLs without any path, such as http://www.php.net

However more recent versions of PHP (e.g., 4.4.7) don't set the path element in the array, so old code will get a PHP warning about an undefined index.

[#42] Michael Muryn [2007-08-27 08:51:08]

Another update to the glue_url function: applied the "isset" treatment to $parsed['pass'].

<?php function glue_url($parsed) { if (!is_array($parsed)) return false; $uri = isset($parsed['scheme']) ? $parsed['scheme'].':'.((strtolower($parsed['scheme']) == 'mailto') ? '' : '//') : ''; $uri .= isset($parsed['user']) ? $parsed['user'].(isset($parsed['pass']) ? ':'.$parsed['pass'] : '').'@' : ''; $uri .= isset($parsed['host']) ? $parsed['host'] : ''; $uri .= isset($parsed['port']) ? ':'.$parsed['port'] : ''; if(isset($parsed['path'])) { $uri .= (substr($parsed['path'], 0, 1) == '/') ? $parsed['path'] : ('/'.$parsed['path']); } $uri .= isset($parsed['query']) ? '?'.$parsed['query'] : ''; $uri .= isset($parsed['fragment']) ? '#'.$parsed['fragment'] : ''; return $uri; } ?>

[#43] stevenlewis at hotmail dot com [2007-08-13 03:08:48]

an update to the glue url function.

you are able to put a host and a path without a slash at the beginning of the path

<?php function glue_url($parsed) { if (! is_array($parsed)) return false; $uri = isset($parsed['scheme']) ? $parsed['scheme'].':'.((strtolower($parsed['scheme']) == 'mailto') ? '':'//'): ''; $uri .= isset($parsed['user']) ? $parsed['user'].($parsed['pass']? ':'.$parsed['pass']:'').'@':''; $uri .= isset($parsed['host']) ? $parsed['host'] : ''; $uri .= isset($parsed['port']) ? ':'.$parsed['port'] : ''; if(isset($parsed['path'])) { $uri .= (substr($parsed['path'],0,1) == '/')?$parsed['path']:'/'.$parsed['path']; } $uri .= isset($parsed['query']) ? '?'.$parsed['query'] : ''; $uri .= isset($parsed['fragment']) ? '#'.$parsed['fragment'] : ''; return $uri; } ?>

[#44] spam at paulisageek dot com [2007-08-08 12:05:17]

In reply to adrian,

Thank you very much for your function. There is a small issue with your relative protocol function. You need to remove the // when making the url the path. Here is the new function.

function resolve_url($base, $url) {
        if (!strlen($base)) return $url;
        // Step 2
        if (!strlen($url)) return $base;
        // Step 3
        if (preg_match('!^[a-z]+:!i', $url)) return $url;
        $base = parse_url($base);
        if ($url{0} == "#") {
                // Step 2 (fragment)
                $base['fragment'] = substr($url, 1);
                return unparse_url($base);
        }
        unset($base['fragment']);
        unset($base['query']);
        if (substr($url, 0, 2) == "//") {
                // Step 4
                return unparse_url(array(
                        'scheme'=>$base['scheme'],
                        'path'=>substr($url,2),
                ));
        } else if ($url{0} == "/") {
                // Step 5
                $base['path'] = $url;
        } else {
                // Step 6
                $path = explode('/', $base['path']);
                $url_path = explode('/', $url);
                // Step 6a: drop file from base
                array_pop($path);
                // Step 6b, 6c, 6e: append url while removing "." and ".." from
                // the directory portion
                $end = array_pop($url_path);
                foreach ($url_path as $segment) {
                        if ($segment == '.') {
                                // skip
                        } else if ($segment == '..' && $path && $path[sizeof($path)-1] != '..') {
                                array_pop($path);
                        } else {
                                $path[] = $segment;
                        }
                }
                // Step 6d, 6f: remove "." and ".." from file portion
                if ($end == '.') {
                        $path[] = '';
                } else if ($end == '..' && $path && $path[sizeof($path)-1] != '..') {
                        $path[sizeof($path)-1] = '';
                } else {
                        $path[] = $end;
                }
                // Step 6h
                $base['path'] = join('/', $path);

        }
        // Step 7
        return unparse_url($base);
}

[#45] christian at resource-it dot dk [2007-08-03 12:57:19]

I searched for an implementation of rfc3986, which is a newer version of rfc 2392. I may find it here : <http://www.chrsen.dk/fundanemt/files/scripter/php/misc/rfc3986.php> - read the rfc at <http://rfc.net/rfc3986.html>

[#46] adrian-php at sixfingeredman dot net [2007-07-25 14:58:40]

Here's a function which implements resolving a relative URL according to RFC 2396 section 5.2. No doubt there are more efficient implementations, but this one tries to remain close to the standard for clarity. It relies on a function called "unparse_url" to implement section 7, left as an exercise for the reader (or you can substitute the "glue_url" function posted earlier).

<?php function resolve_url($base, $url) { if (!strlen($base)) return $url; // Step 2 if (!strlen($url)) return $base; // Step 3 if (preg_match('!^[a-z]+:!i', $url)) return $url; $base = parse_url($base); if ($url{0} == "#") { // Step 2 (fragment) $base['fragment'] = substr($url, 1); return unparse_url($base); } unset($base['fragment']); unset($base['query']); if (substr($url, 0, 2) == "//") { // Step 4 return unparse_url(array( 'scheme'=>$base['scheme'], 'path'=>$url, )); } else if ($url{0} == "/") { // Step 5 $base['path'] = $url; } else { // Step 6 $path = explode('/', $base['path']); $url_path = explode('/', $url); // Step 6a: drop file from base array_pop($path); // Step 6b, 6c, 6e: append url while removing "." and ".." from // the directory portion $end = array_pop($url_path); foreach ($url_path as $segment) { if ($segment == '.') { // skip } else if ($segment == '..' && $path && $path[sizeof($path)-1] != '..') { array_pop($path); } else { $path[] = $segment; } } // Step 6d, 6f: remove "." and ".." from file portion if ($end == '.') { $path[] = ''; } else if ($end == '..' && $path && $path[sizeof($path)-1] != '..') { $path[sizeof($path)-1] = ''; } else { $path[] = $end; } // Step 6h $base['path'] = join('/', $path); } // Step 7 return unparse_url($base); } ?>

[#47] Elliott Brueggeman [2007-06-03 15:59:52]

Note that if you pass this function a url without a scheme (www.php.net, as opposed to http://www.php.net), the function will incorrectly parse the results. In my test case it returned the domain under the ['path'] element and nothing in the ['host'] element.

[#48] Marc-Antoine Ross [2007-03-14 08:10:13]

Do not look for the fragment in $_SERVER['QUERY_STRING'], you will not find it. You should read the fragment in JavaScript for example.

[#49] alistair at 21degrees dot com dot au [2006-10-23 19:21:24]

Heres a simple function to add the $component option in for PHP4. Haven't done exhaustive testing, but should work ok.

<?php ## Defines only available in PHP 5, created for PHP4 if(!defined('PHP_URL_SCHEME')) define('PHP_URL_SCHEME', 1); if(!defined('PHP_URL_HOST')) define('PHP_URL_HOST', 2); if(!defined('PHP_URL_PORT')) define('PHP_URL_PORT', 3); if(!defined('PHP_URL_USER')) define('PHP_URL_USER', 4); if(!defined('PHP_URL_PASS')) define('PHP_URL_PASS', 5); if(!defined('PHP_URL_PATH')) define('PHP_URL_PATH', 6); if(!defined('PHP_URL_QUERY')) define('PHP_URL_QUERY', 7); if(!defined('PHP_URL_FRAGMENT')) define('PHP_URL_FRAGMENT', 8); function parse_url_compat($url, $component=NULL){ if(!$component) return parse_url($url); ## PHP 5 if(phpversion() >= 5) return parse_url($url, $component); ## PHP 4 $bits = parse_url($url); switch($component){ case PHP_URL_SCHEME: return $bits['scheme']; case PHP_URL_HOST: return $bits['host']; case PHP_URL_PORT: return $bits['port']; case PHP_URL_USER: return $bits['user']; case PHP_URL_PASS: return $bits['pass']; case PHP_URL_PATH: return $bits['path']; case PHP_URL_QUERY: return $bits['query']; case PHP_URL_FRAGMENT: return $bits['fragment']; } } ?>

[#50] TheShadow [2004-12-30 12:36:16]

You may want to check out the PEAR NET_URL class. It provides easy means to manipulate URL strings.

http://pear.php.net/package/Net_URL

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