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run code in 150+ php & hhvm versions
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<?php $myArray = array( "a", array( "a", "b", array( "a", "b", "c", array( "a", "b", "c", "d", array("the end") ) ) ) ); $recursive_array_iterator = new RecursiveArrayIterator($myArray); iterator_apply(new ArrayObject($recursive_array_iterator), 'traverseRecursiveArray', array($recursive_array_iterator)); function traverseRecursiveArray($iterator) { while ($iterator->valid()) { if ($iterator->hasChildren()) { traverseRecursiveArray($iterator->getChildren()); } else { $iterator->offsetSet($iterator->key(), manipulate($iterator->current())); echo $iterator->key() . ' => ' . $iterator->current() . PHP_EOL; } $iterator->next(); } } function manipulate($string) { $string .= " appended"; return $string; } var_dump($myArray);
Output for 5.2.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
0 => a appended 0 => a appended 1 => b appended 0 => a appended 1 => b appended 2 => c appended 0 => a appended 1 => b appended 2 => c appended 3 => d appended 0 => the end appended array(2) { [0]=> string(1) "a" [1]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> array(1) { [0]=> string(7) "the end" } } } } }
Output for 5.2.0 - 5.2.3
0 => a appended 0 => a appended 1 => b appended 0 => a appended 1 => b appended 2 => c appended 0 => a appended 1 => b appended 2 => c appended 3 => d appended 0 => the end appended array(2) { [0]=> string(10) "a appended" [1]=> array(3) { [0]=> string(10) "a appended" [1]=> string(10) "b appended" [2]=> array(4) { [0]=> string(10) "a appended" [1]=> string(10) "b appended" [2]=> string(10) "c appended" [3]=> array(5) { [0]=> string(10) "a appended" [1]=> string(10) "b appended" [2]=> string(10) "c appended" [3]=> string(10) "d appended" [4]=> array(1) { [0]=> string(16) "the end appended" } } } } }
Output for 5.1.0 - 5.1.6
Fatal error: Call to undefined function iterator_apply() in /in/0BoJG on line 24
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Class 'RecursiveArrayIterator' not found in /in/0BoJG on line 23
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: recursivearrayiterator in /in/0BoJG on line 23
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: recursivearrayiterator in /in/0BoJG on line 23