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<?php function up(&$text) { return strtoupper($text); } $array = array("hi", "bye", "how", "bY", array("test", "trial", array("hover"))); array_walk_recursive($array, 'up'); print_r($array); ?>
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 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 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => hi [1] => bye [2] => how [3] => bY [4] => Array ( [0] => test [1] => trial [2] => Array ( [0] => hover ) ) )
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_walk_recursive() in /in/kXkC2 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: array_walk_recursive() in /in/kXkC2 on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_walk_recursive() in /in/kXkC2 on line 6

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