3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { function __construct() { echo __CLASS__ , "\n"; } } class B extends A { function __construct() { parent::__construct(); echo __CLASS__ , "\n"; parent::__construct(); return "PHP\n"; } } $b = new B; echo $b->__construct();
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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
A B A A B A PHP
preferences:
150.95 ms | 408 KiB | 5 Q