Online PHP editor | output for Lkn8j

@ 2020-04-17T15:00:39Z

<?php

abstract class Animal
{
    protected string $name;

    public function __construct(string $name)
    {
        $this->name = $name;
    }

    abstract public function speak();
}

class Cat extends Animal 
{
    public function speak()
    {
        echo $this->name . " meows";
    }
}

// However, covariant return types cannot return a more broad type

interface AnimalShelter
{
    public function adopt(string $name): Cat;
}

class CatShelter implements AnimalShelter
{
    public function adopt(string $name): Animal
    {
        return new Animal($name);
    }
}

$kitty = (new CatShelter)->adopt("Ricky");
$kitty->speak();

Output for 8.5.0 - 8.5.3: Fatal error: Declaration of CatShelter::adopt(string $name): Animal must be compatible with AnimalShelter::adopt(string $name): Cat in /in/Lkn8j on line 32 Stack trace: #0 {main}
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18: Fatal error: Declaration of CatShelter::adopt(string $name): Animal must be compatible with AnimalShelter::adopt(string $name): Cat in /in/Lkn8j on line 32
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Parse error: syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/Lkn8j on line 5
Process exited with code 255.

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