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$parts = parse_url('http://example.com/user/22?r=4');
// $parts return:
// Array
// (
//     [scheme] => http
//     [host] => example.com
//     [path] => /user/22
//     [query] => r=4&e=key
// )

parse_str($parts['query'], $query);
// $query return:
// Array
// (
//     [r] => 4
//     [e] => key
// )