3v4l.org

run code in 300+ PHP versions simultaneously
<?php $oi = "oioioioioi"; $oi2 = $oi; $oi[4] = 20; var_dump($oi); var_dump($oi2);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Only the first byte will be assigned to the string offset in /in/iHuuQ on line 5 string(10) "oioi2ioioi" string(10) "oioioioioi"
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.4 - 7.4.33
string(10) "oioi2ioioi" string(10) "oioioioioi"

preferences:
128.46 ms | 402 KiB | 131 Q