How to use http_build_query, parse_url, parse_str to create and parse url through php

1.http_build_query

http_build_query can create the request string after urlencode.

string http_build_query ( mixed $query_data [, string $numeric_prefix [, string $arg_separator [, int $enc_type = PHP_QUERY_RFC1738 ]]] )

Parameters:
query_data
Can be an array or an object containing attributes.

A query_data array can be a simple one-dimensional structure, or an array composed of arrays (which in turn can contain other arrays).

If query_data is an object, only public attributes will be added to the result.

numeric_prefix
If a numeric subscript is used in the underlying array and this parameter is given, the parameter value will be used as the number in the underlying array The prefix for subscripted elements.

This is to allow PHP or other CGI programs to obtain legal variable names when decoding the data later.

arg_separator
Unless this parameter is specified and used, arg_separator.output will be used to separate parameters (this parameter is available in php.ini, the default is "&").

enc_type
The default is PHP_QUERY_RFC1738.

If enc_type is PHP_QUERY_RFC1738, the encoding will be encoded in accordance with the » RFC 1738 standard and the application/x-www-form-urlencoded media type, and spaces will be encoded as plus signs ( ).

If enc_type is PHP_QUERY_RFC3986, it will be encoded according to » RFC 3986, and spaces will be percent encoded ( ).
Example 1: Use only query_data parameter

<?php$data = array(    &#39;name&#39; => &#39;fdipzone&#39;,    &#39;gender&#39; => &#39;male&#39;,    &#39;profession&#39; => &#39;programmer&#39;,    &#39;explain&#39; => &#39;a new programmer&#39;);echo http_build_query($data);?>

Output:
name=fdipzone&gender=male&profession=programmer&explain=a new programmer

##Example 2: query_data uses a one-dimensional subscript array, specify numeric_prefix=info_,arg_separator=#,enc_type=PHP_QUERY_RFC3986

<?php$data = array(&#39;fdipzone&#39;,&#39;male&#39;,&#39;programmer&#39;,&#39;a new programmer&#39;);echo http_build_query($data, &#39;info_&#39;, &#39;#&#39;, PHP_QUERY_RFC3986);?>

Output:

info_0=fdipzone#info_1=male#info_2=programmer#info_3=a%20new%20programmer

2.parse_url

parse_url parses the url and returns its components

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

Parameters:
url The url to be parsed, invalid characters will be replaced with _

##component Use one of PHP_URL_PATH, PHP_URL_QUERY or PHP_URL_FRAGMENT to get the string of the specified part of the URL. (Except when specified as PHP_URL_PORT, an integer value will be returned).

Return value:

For severely unqualified URLs, parse_url() may return FALSE.
The returned data generally includes the following

scheme (such as http), host, port, user, pass, path, query (after the question mark?), fragment (after the hash symbol #)

Example:

<?php$url = &#39;http://fdipzone:123456@www.fdipzone.com:80/test/index.php?id=1#tag&#39;;
print_r(parse_url($url));echo parse_url($url, PHP_URL_SCHEME).PHP_EOL;echo parse_url($url, PHP_URL_HOST).PHP_EOL;echo parse_url($url, PHP_URL_PORT).PHP_EOL;echo parse_url($url, PHP_URL_USER).PHP_EOL;echo parse_url($url, PHP_URL_PASS).PHP_EOL;echo parse_url($url, PHP_URL_PATH).PHP_EOL;echo parse_url($url, PHP_URL_QUERY).PHP_EOL;echo parse_url($url, PHP_URL_FRAGMENT).PHP_EOL;?>

Output:

Array(
    [scheme] => http
    [host] => www.fdipzone.com
    [port] => 80
    [user] => fdipzone
    [pass] => 123456
    [path] => /test/index.php
    [query] => id=1
    [fragment] => tag
)
http
www.fdipzone.com80fdipzone123456/test/index.php
id=1tag

3.parse_str

parse_str will The string is parsed into multiple variables

void parse_str ( string $str [, array &$arr ] )

If str is the query string passed in by the URL, it is parsed into a variable and set to the current scope.

Parameters:

str Input string

arr If the second variable arr is set, the variable will be stored in this array as an array element as a replacement.
Example 1:
Resolve to the current scope

<?php$str = &#39;name=fdipzone&gender=male&profession=programer&explain=a new programmer&#39;;
parse_str($str);echo $name.PHP_EOL;echo $gender.PHP_EOL;echo $profession.PHP_EOL;echo $explain.PHP_EOL;?>

Output:

fdipzone
male
programera new programmer

Example 2:
Save the result to the arr array

<?php$str = &#39;name=fdipzone&gender=male&profession=programer&explain=a new programmer&#39;;
parse_str($str, $arr);
print_r($arr);?>

Output:

Array(
    [name] => fdipzone
    [gender] => male
    [profession] => programer
    [explain] => a new programmer
)

4. Get the query parameter of the url and parse it

First Use parse_url to get the query, and then use parse_str to parse the parameters

<?php$url = &#39;http://www.fdipzone.com/test/index.php?name=fdipzone&gender=male&profession=programmer&explain=a new programmer&#39;;$query = parse_url($url, PHP_URL_QUERY);
parse_str($query, $data);
print_r($data);?>

Output:

Array(
    [name] => fdipzone
    [gender] => male
    [profession] => programmer
    [explain] => a new programmer
)

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