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<?php function my_map($data, callable $func) { $length = count($data); for ($i=0; $i<$length; $i++) { $data[$i] = $func( $data[$i] ); } return $data; } $square = function($val) { return $val * $val; }; $vals = [0, 1, 2, 3, 4, 5]; var_dump( my_map($vals, $square) );
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> int(0) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(16) [5]=> int(25) }

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