3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "\xb7\x51 &\xb4\xa6\xb6\x7d"; $pos1 = mb_strpos($str,'&',0,'utf-8'); var_dump($pos1); $pos2 = mb_strpos($str,'&',$pos1 + 1,'utf-8'); var_dump($pos2);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.23, 8.1.0 - 8.1.10
int(2) int(2)

preferences:
63.86 ms | 410 KiB | 5 Q