3v4l.org

run code in 300+ PHP versions simultaneously
<?php $css1 = ''; $time = microtime(true); for($i = 0; $i < 100000; $i++) { $css1 .= sprintf('foo %d', $i); } $time = microtime(true) - $time; echo number_format($time, 3) . 's'; $css2 = ''; $time = microtime(true); for($i = 0; $i < 100000; $i++) { $css2[] = sprintf('foo %d', $i); } $time = microtime(true) - $time; $css3 = implode('', $css2); echo number_format($time, 3) . 's';

preferences:
39.73 ms | 402 KiB | 5 Q