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run code in 300+ PHP versions simultaneously
<?php class Foo { public function __construct() { var_dump('created!'); } } class Bar { public function getFoo() { static $foo; return $foo ?? ($foo = new Foo); } } $bar = new Bar; var_dump($bar->getFoo(), $bar->getFoo(), $bar->getFoo());

preferences:
34.74 ms | 402 KiB | 5 Q