Please consider using the the latest stable version for any production code.

Parse & Build a Query

The League\Uri\Components\QueryString is a userland PHP URI query parser and builder.

<?php

use League\Uri\Components\QueryString;

$pairs = QueryString::parse('module=home&action=show&page=😓');
// returns [
//     ['module', 'home'],
//     ['action', 'show'],
//     ['page', '😓']
// ];

$str = QueryString::build($pairs, '|');
// returns 'module=home|action=show|page=😓'

Usage

The parsing/building algorithms preserve pairs order and uses the same algorithm used by JavaScript UrlSearchParams

Parsing the URI query string

Parsing a query string is easy.

$pairs = QueryString::parse('module=home&action=show&page=😓');
// returns [
//     ['module', 'home'],
//     ['action', 'show'],
//     ['page', '😓']
// ];

Description

<?php

public static function QueryString::parse($query, string $separator = '&', int $enc_type = PHP_QUERY_RFC3986): array;

The returned array is a collection of key/value pairs. Each pair is represented as an array where the first element is the pair key and the second element the pair value. While the pair key is always a string, the pair value can be a string or the null value.

The QueryString::parse method parameters are:

• $query can be the null value, any scalar or object which is stringable;
• $separator is a string; by default it is the & character;
• $enc_type is one of PHP’s constant PHP_QUERY_RFC3968 or PHP_QUERY_RFC1738 which represented the supported encoding algoritm
  • If you specify PHP_QUERY_RFC3968 decoding will be done using RFC3986 rules;
  • If you specify PHP_QUERY_RFC1738 decoding will be done using application/x-www-form-urlencoded rules;

Here’s a simple example showing how to use all the given parameters:

<?php

$pairs = QueryString::parse(
    'module=home:action=show:page=toto+bar&action=hide',
    ':',
    PHP_QUERY_RFC1738
);
// returns [
//     ['module', 'home'],
//     ['action', 'show'],
//     ['page', 'toto bar'],
//     ['action', 'hide'],
// ];

The $separator argument can not be the empty string.

Building the URI query string

To convert back the collection of key/value pairs into a valid query string or the null value you can use the static public QueryString::build method.

<?php

$pairs = QueryString::build([
    ['module', 'home'],
    ['action', 'show'],
    ['page', 'toto bar'],
    ['action', 'hide'],
], '|', PHP_QUERY_RFC3986);

// returns 'module=home|action=show|page=toto%20bar|action=hide';

Description

<?php

public static function QueryString::build(iterable $pairs, string $separator = '&', int $enc_type = PHP_QUERY_RFC3986): ?string;

The static public QueryString::build method parameters are:

• $pairs an iterable structure containing a collection of key/pair pairs as describe in the returned array of the QueryString::parse method.
• $separator is a string; by default it is the & character;
• $enc_type is one of PHP’s constant PHP_QUERY_RFC3968 or PHP_QUERY_RFC1738 which represented the supported encoding algoritm
  • If you specify PHP_QUERY_RFC3968 encoding will be done using RFC3986 rules;
  • If you specify PHP_QUERY_RFC1738 encoding will be done using application/x-www-form-urlencoded rules;
• the function returns the null value if the submitted collection is empty.

The $separator argument can not be the empty string.

Extracting PHP variables

<?php

public static function QueryString::extract($query, string $separator = '&', int $enc_type = PHP_QUERY_RFC3986): array;
public static function QueryString::convert(iterable $pairs): array;

QueryString::parse and QueryString::build preserve the query string pairs content and order. If you want to extract PHP variables from the query string à la parse_str you can use:

• The QueryString::extract method which takes the same parameters as QueryString::parse
• The QueryString::convert method which takes the result of QueryString::parse

both methods, however, do not allow parameters key mangling in the returned array like parse_str;

<?php

$query = 'module=show&arr.test[1]=sid&arr test[4][two]=fred&+module+=hide';

$params = QueryString::extract($query, '&', PHP_QUERY_RFC1738);
// $params contains [
//     'module' = 'show',
//     'arr.test' => [
//         1 => 'sid',
//     ],
//     'arr test' => [
//         4 => [
//             'two' => 'fred',
//         ]
//     ],
//     ' module ' => 'hide',
// ];

parse_str($query, $variables);
// $variables contains [
//     'module' = 'show',
//     'arr_test' => [
//         1 => 'sid',
//         4 => [
//             'two' => 'fred',
//         ],
//     ],
//     'module_' = 'hide',
// ];

Exceptions

All exceptions extends the League\Uri\Exceptions\UriException marker class which extends PHP’s Throwable class.

<?php

use League\Uri\Exception\InvalidUriComponent;
use League\Uri\Parser\QueryString;

try {
    QueryString::extract('foo=bar', '&', 42);
} catch (UriException $e) {
    //$e is an instanceof League\Uri\Exceptions\SyntaxError
}