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<?php class Email { private $value; public function __construct(string $value) { $this->value = $value; } } $email = new Email('opexus@gmail.com'); echo json_encode(compact('email'));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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
{"email":{}}
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Catchable fatal error: Argument 1 passed to Email::__construct() must be an instance of string, string given, called in /in/DTrM7 on line 15 and defined in /in/DTrM7 on line 6
Process exited with code 255.

preferences:
225.51 ms | 402 KiB | 282 Q