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run code in 300+ PHP versions simultaneously
<?php class X { public function filter($n = null) { return new X; } } $a = new X; $b = $a->filter(); $f = function(){}; $c = $a->filter($f); var_dump($a, $b, $c, $f);
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(X)#1 (0) { } object(X)#2 (0) { } object(X)#4 (0) { } object(Closure)#3 (3) { ["name"]=> string(21) "{closure:/in/jAsAX:9}" ["file"]=> string(9) "/in/jAsAX" ["line"]=> int(9) }
Output for 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
object(X)#1 (0) { } object(X)#2 (0) { } object(X)#4 (0) { } object(Closure)#3 (0) { }

preferences:
83.14 ms | 1485 KiB | 4 Q