3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { private $callable; public function __construct() { $this->callable = function () { echo "hello world!"; }; } public function yesItDoes() { $this->callable->call($this); } } (new Foo)->yesItDoes();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
hello world!
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Fatal error: Call to undefined method Closure::call() in /in/rj4BU on line 12
Process exited with code 255.
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206.85 ms | 402 KiB | 224 Q