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run code in 300+ PHP versions simultaneously

@ 2019-12-14T16:27:10Z

<?php

abstract class Animal
{
    protected $name;
    
    public function __construct(string $name) 
    {
        $this->name = $name;
    }

    abstract public function speak();
}

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

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

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

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

class DogShelter implements AnimalShelter
{
    public static function adopt(string $name): Dog
    {
        return new Dog($name);
    }
}

$kitty = CatShelter::adopt("Ricky");
$kitty->speak();
echo "\n";

$doggy = DogShelter::adopt("Mavrick");
$doggy->speak();

Output for 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 - 8.3.4, 8.3.6 - 8.3.7: Ricky meows Mavrick barks
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Ricky meows Mavrick barks
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Fatal error: Declaration of CatShelter::adopt(string $name): Cat must be compatible with AnimalShelter::adopt(string $name): Animal in /in/nJT9R on line 34
Process exited with code 255.

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