PHP uses http_build_query, parse_url, parse_str to create and parse urls

php uses http_build_query, parse_url, and parse_str to create and parse URLs. Friends in need can refer to it.

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 properties.

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 numeric subscripts are used in the underlying array and this parameter is given, this parameter value will be used as a prefix for the numeric subscript elements in the underlying array.

This is to allow PHP or other CGI programs to obtain valid 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
By default, PHP_QUERY_RFC1738 is used.

If enc_type is PHP_QUERY_RFC1738, the encoding will be based on 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 (%20).


Example 1: Only use query_data parameter

$data = array(
 'name' => 'fdipzone',
 'gender' => 'male',
 'profession' => 'programmer',
 'explain ' => 'a new programmer'
);
echo http_build_query($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

$data = array('fdipzone','male','programmer','a new programmer');
echo http_build_query($data, 'info_', '#', 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
URL to be parsed, invalid characters will be replaced with _

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

Return value:
parse_url() may return FALSE for severely unqualified URLs.

The returned data generally includes the following types
scheme (such as http), host, port, user, pass, path, query (after the question mark?), fragment (after the hash symbol #)


Example:

$url = 'http://fdipzone:123456@www.fdipzone.com:80/test/index.php?id=1#tag';
print_r(parse_url($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.com
80
fdipzone
123456
/ test/index.php
id=1
tag

3.parse_str

parse_str parses a string into multiple variables

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

If str is the query string passed in by the URL, parse it into a variable and set it 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 instead.


Example 1: Resolve to the current scope

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

Output:

fdipzone
male
programer
a new programmer

Example 2: Save the result to the arr array

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

Output:

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

4. Get the query parameters of the url and parse them

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

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

Output:

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

php, http