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run code in 300+ PHP versions simultaneously
<?php class C1 { public function __construct($p) { $this->p = $p; } } class C2 { public function __construct(C1 $c) { $this->c = $c; } } $c1 = new C1(1); $c2 = new C2($c1); $c1 = new C1(2); var_dump($c2->c->p);

preferences:
32.84 ms | 402 KiB | 5 Q