3v4l.org

run code in 300+ PHP versions simultaneously
<?php do { $eai = "え" . mb_convert_encoding(chr(0x82) . chr(0x9f + mt_rand(0, 52)), 'utf-8', 'SJIS-win') . "い"; echo PHP_EOL, $eai; } while ($eai !== "えあい"); echo "っ!";

preferences:
25.31 ms | 402 KiB | 5 Q