3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('ARRAY_SIZE', 512); define('RUNS', 10000); function benchmark($function, $desc) { $total_time = 0; for($i = 0; $i < RUNS; $i++) { $total_time += $function(); } echo sprintf('%dx %s took %.5f seconds' . PHP_EOL, RUNS, $desc, $total_time); } benchmark(function() { $r = range(0, ARRAY_SIZE); $start = microtime(true); foreach ($r as $k => $v) { for($i = 0; $i++ < $v;) { $r[$k] = $v * $v; }} return microtime(true) - $start; }, 'foreach'); benchmark(function() { $r = range(0, ARRAY_SIZE); $start = microtime(true); $r = array_map(function($each) { return $each * $each; }, $r); return microtime(true) - $start; }, 'array_map');

preferences:
34.54 ms | 402 KiB | 5 Q