3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = ""; for($i = 0; $i < 1024; $i++) $s = $s . ($i % 10); $start = microtime(); for($i = 0; $i < 10000; $i++) strpos($s, "abcdef"); $end = microtime(); echo "Duration: " . ($end - $start) . " s\n"; ?>

preferences:
34.8 ms | 402 KiB | 5 Q