Online PHP editor | output for 4GMe4

@ 2015-11-02T19:22:35Z

<?php

class Email implements JsonSerializable
{
    private $value;
    public function __construct(string $value)
    {
        $email = filter_var($value, FILTER_VALIDATE_EMAIL);
        if (false === $email) {
            throw new Exception('Email is invalid.');
        }
        $this->value = $email;
    }
    public function jsonSerialize()
    {
        return $this->value;
    }
}
class Age implements JsonSerializable
{
    private $value;
    public function __construct(int $value)
    {
        if ($value > 150) {
            throw new Exception('Age must be less than 150.');
        }
        $this->value = $value;
    }
    public function jsonSerialize()
    {
        return $this->value;
    }
}


$email = new Email('opexus@gmail.com');
$age = new Age(23);
echo json_encode(compact('email', 'age'));

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: Return type of Email::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/4GMe4 on line 14 Deprecated: Return type of Age::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/4GMe4 on line 29 {"email":"opexus@gmail.com","age":23}
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: {"email":"opexus@gmail.com","age":23}
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/4GMe4 on line 36 and defined in /in/4GMe4 on line 6
Process exited with code 255.

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