3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'Hello'; $string .= ' world'; echo $string;
Output for 7.1.25 - 7.1.27, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Hello world
preferences:
161.38 ms | 407 KiB | 5 Q