3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(preg_match('//u',"\xef\xbf\xbf"));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.23, 5.4.0 - 5.4.13, 5.4.41 - 5.4.45, 5.5.10 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(1)
Output for 5.3.24 - 5.3.29, 5.4.14 - 5.4.40, 5.5.0 - 5.5.9
bool(false)

preferences:
295.48 ms | 402 KiB | 393 Q