3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(preg_replace("#\PZ+#u", "", "\r\n\r\n"));;
Output for 5.6.0 - 5.6.25, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0 - 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 - 8.3.26, 8.4.1 - 8.4.13
string(0) ""
preferences:
122.66 ms | 408 KiB | 5 Q