3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = 'abc\def'; var_dump(__LINE__.':'.preg_replace('#\\\#', '', $s)); var_dump(__LINE__.':'.preg_replace('#\\#', '', $s));
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(8) "3:abcdef" Warning: preg_replace(): No ending delimiter '#' found in /in/Td9vj on line 4 string(2) "4:"
preferences:
65.4 ms | 406 KiB | 5 Q