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run code in 500+ PHP versions simultaneously
<?php class B { protected $x = 'x'; function foo() { return $this->x; } } class C extends B { protected $x = 'y'; function foo() { return $this->x . parent::foo(); } } $c = new C; var_export($c->foo());

preferences:
21.85 ms | 474 KiB | 4 Q