Online PHP editor | output for MgU9b

@ 2016-09-04T09:50:27Z

<?php

interface AggregateRoot
{}

class Customer implements AggregateRoot
{}

interface AggregateRootFactory
{
    public function create() : AggregateRoot;
}

class CustomerFactory implements AggregateRootFactory
{
    public function create() : Customer // Customer is subtype of AggregateRoot, it should work
    {
        return new Customer();
    }
}

$factory = new CustomerFactory();
$customer = $factory->create();

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 7.0.0 - 7.0.10, 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Fatal error: Declaration of CustomerFactory::create(): Customer must be compatible with AggregateRootFactory::create(): AggregateRoot in /in/MgU9b on line 14
Process exited with code 255.
Output for 5.6.0 - 5.6.25: Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/MgU9b on line 11
Process exited with code 255.

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