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run code in 300+ PHP versions simultaneously
<?php function array_map_key(Callable $callback, $array) { $return = array(); foreach ($array as $key => $value) { list($k,$v) = $callback($key, $value); $return[$k] = $v; } return $return; } function my_call_back($key, $value) { return array($value, strlen($value)); } $array = explode(" ", "PHP stands for PHP hypertext preprocessor"); $array = array_map_key('my_call_back', $array); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { ["PHP"]=> int(3) ["stands"]=> int(6) ["for"]=> int(3) ["hypertext"]=> int(9) ["preprocessor"]=> int(12) }

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