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@ 2015-12-03T06:26:56Z

<?php

$arr = Array
(
"data" => 'check',
"test1" => Array
    (
        "data" => 'Hello',
    ),

"test2" => Array
    (
        "data" => 'world'
    ),

"test3" => Array
    (
        "data" => 'bar',
        "tst" => Array
            (
                "data" => 'Lorem',
                "bar" => Array
                    (
                        "data" => 'doller',
                        "foo" => Array
                            (
                                "data" => 'sit',
                            )

                    )

            )

    ),

"test4" => Array
    (
        "data" => 'HELLO',
        "tst" => Array
            (
                "data" => 'ipsum',
                "bar" => Array
                    (
                        "data" => 'Lorem',
                    )

            )

    )

);
$result = [];
array_walk_recursive($arr, function($v) use (&$result) {
    $result[] = $v;
});
echo implode('&', $result);

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: check&Hello&world&bar&Lorem&doller&sit&HELLO&ipsum&Lorem

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256.7 ms | 404 KiB | 341 Q