3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "doamin\username"; $newStr = str_replace('`\`','`\\\\`',$string); echo $newStr;
Output for 7.0.0 - 7.0.24, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
doamin\username
preferences:
138.12 ms | 408 KiB | 5 Q