3v4l.org

run code in 300+ PHP versions simultaneously
<?php $UUID = "f9e113324bd449809b98b0925eac3141"; echo preg_replace('/(?:^.{4})?.{4}\K/', '-', $UUID, 4);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
f9e11332-4bd4-4980-9b98-b0925eac3141

preferences:
93.55 ms | 406 KiB | 5 Q