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run code in 300+ PHP versions simultaneously
<?php class A { public $x; public function foo() { $this->x(42); } } $a = new A; $a->x = function($v) {var_dump($v);}; $a->x();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Call to undefined method A::x() in /in/R1CE0:11 Stack trace: #0 {main} thrown in /in/R1CE0 on line 11
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Call to undefined method A::x() in /in/R1CE0 on line 11
Process exited with code 255.

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