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run code in 500+ PHP versions simultaneously
<?php class A { public function m() { static $x; if ($x === null) { $x = get_class($this); } return $x; } } class B extends A { } $a = new A(); $b = new B(); echo $a->m()."\n"; echo $b->m()."\n";
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
A A
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
A B

preferences:
70.7 ms | 1404 KiB | 4 Q