3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { private $foo; function __construct() { $this->foo = $foo; } } new Foo;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Warning: Undefined variable $foo in /in/b7ELd on line 1
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: foo in /in/b7ELd on line 1
Output for 7.3.32 - 7.3.33
preferences:
130.42 ms | 401 KiB | 244 Q