3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { static private $fn; static public function reg() { $x = new foo; self::$fn = function () use ($x) { $x->bar(); }; } public function baz() { (self::$fn)(); } private function bar() { echo 'bar'; } } foo::reg(); $foo = new foo; $foo->baz();
Output for 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bar
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '(' in /in/sE7d6 on line 16
Process exited with code 255.
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202.09 ms | 402 KiB | 327 Q