Benchmarks

foreach-array_map.php

<?php

$numbers = \range(0, 100000);
$result = [];

$start = \microtime(true);
foreach ($numbers as $number) {
    $result[] = $number * 10;
}
$end = \microtime(true);
echo 'total time foreach: ' . ($end-$start);
echo "\n";

$start = \microtime(true);
$result = \array_map(function($n) { return $n * 10; }, $numbers);
$end = \microtime(true);
echo 'total time map: ' . ($end-$start);

/*
 * Results: PHP5.6 (related to V1 environment)
+ total time foreach: 0.26890397071838
- total time map: 1.4822571277618
Results: PHP7.2
+ total time foreach: 0.012457847595215
- total time map: 0.098356962203979
 */