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<?php class A { public function __construct(string $a) { var_dump($a); } } class B extends A { public function __construct(int $z, int $y) { parent::__construct($z . $y); } } $b = new B(1, 2);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(2) "12"
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Catchable fatal error: Argument 1 passed to B::__construct() must be an instance of int, integer given, called in /in/raZYt on line 17 and defined in /in/raZYt on line 11
Process exited with code 255.

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