3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo strtr(20 / 3 * 1e6, ',', '.') . "\n"; echo strtr(6.66, ',', '.') . "\n"; echo strtr(6.0, ',', '.') . "\n"; echo "\n";

preferences:
36.71 ms | 402 KiB | 5 Q