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run code in 300+ PHP versions simultaneously
<?php $MAP = [ ['x', 'x', 'x', 'x'], ['x', 's', 'p', 'x'], ['x', 'p', 'p', 'x'], ['x', 'p', 'p', 'x'], ['x', 'p', 'p', 'x'], ['x', 'p', 'p', 'x'], ['x', 'x', 'x', 'x'], ]; $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($MAP)); foreach($iterator as $key => $value) { var_dump($key.' => '.$value); }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(6) "0 => x" string(6) "1 => x" string(6) "2 => x" string(6) "3 => x" string(6) "0 => x" string(6) "1 => s" string(6) "2 => p" string(6) "3 => x" string(6) "0 => x" string(6) "1 => p" string(6) "2 => p" string(6) "3 => x" string(6) "0 => x" string(6) "1 => p" string(6) "2 => p" string(6) "3 => x" string(6) "0 => x" string(6) "1 => p" string(6) "2 => p" string(6) "3 => x" string(6) "0 => x" string(6) "1 => p" string(6) "2 => p" string(6) "3 => x" string(6) "0 => x" string(6) "1 => x" string(6) "2 => x" string(6) "3 => x"

preferences:
71.68 ms | 1618 KiB | 4 Q