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<?php class Foo { public function __construct($arg) { var_dump($arg); } } new Foo();
Output for 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
Fatal error: Uncaught ArgumentCountError: Too few arguments to function Foo::__construct(), 0 passed in /in/I8jok on line 9 and exactly 1 expected in /in/I8jok:4 Stack trace: #0 /in/I8jok(9): Foo->__construct() #1 {main} thrown in /in/I8jok on line 4
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Warning: Missing argument 1 for Foo::__construct(), called in /in/I8jok on line 9 and defined in /in/I8jok on line 4 Notice: Undefined variable: arg in /in/I8jok on line 5 NULL

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