Is there a PHP function to convert a query string to an array?

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You want parse_str(). Pass it an array as the 2nd parameter and it will extract variables from the query string you give it into the array:

<?php
$str = "first=value&arr[]=foo+bar&arr[]=baz";

parse_str($str, $output);

print_r($output);

/*
Array
(
    [first] => value
    [arr] => Array
        (
            [0] => foo bar
            [1] => baz
        )

)
*/

Notice this is the very first related function listed on the http_build_query page.

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