3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'bar'; $str[1] = 'A'; echo $str; $char ='3'; $pos = '2'; $str = substr_replace($str,$char,$pos,1); echo '\n'; echo $str;
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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
bAr\nbA3

preferences:
223.41 ms | 404 KiB | 326 Q