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@ 2016-04-09T00:50:17Z

<?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
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

89.46 ms | 404 KiB | 5 Q