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<?php declare(strict_types=1); class Test { public static function valid(?float $value): bool { if ($value !== null && !is_float($value)) throw new InvalidArgumentException('Not valid'); return true; } } var_dump(Test::valid('1.2')); // "valid" because of implicit typecast, which can disabled with declare strict_types var_dump(Test::valid('not a number')); // triggers TypeError, NOT InvalidArgumentException
Output for git.master_jit, git.master
Fatal error: Uncaught TypeError: Test::valid(): Argument #1 ($value) must be of type ?float, string given, called in /in/mNaCv on line 13 and defined in /in/mNaCv:6 Stack trace: #0 /in/mNaCv(13): Test::valid('1.2') #1 {main} thrown in /in/mNaCv on line 6
Process exited with code 255.

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