Online PHP editor | output for sZ9XB

@ 2020-02-13T07:46:08Z

<?php

interface ParentInterface {}

interface ChildInterface extends ParentInterface {}

interface OriginalHandlerInterface
{
    public function handle(ParentInterface $a): string;
}

interface AnotherHandlerInterface
{ 
    public function handle(ChildInterface $a): string;
}

class RegularImplementor implements AnotherHandlerInterface
{
    public function handle(ChildInterface $a): string {
        return class_name($a);
    }
}

class ContravariantImplementor implements AnotherHandlerInterface
{
    public function handle(ParentInterface $a): string {
        return class_name($a);
    }
}

class OriginalImplementor implements OriginalHandlerInterface
{
    public function handle(ParentInterface $a) : string
    {
        return class_name($a);
    }
}


// this will error out
class WrongOriginalImplementor implements OriginalHandlerInterface
{
    public function handle(ChildInterface $a) : string
    {
        return class_name($a);
    }
}

Output for 8.5.0 - 8.5.1: Fatal error: Declaration of WrongOriginalImplementor::handle(ChildInterface $a): string must be compatible with OriginalHandlerInterface::handle(ParentInterface $a): string in /in/sZ9XB on line 43 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
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 - 8.3.28, 8.4.1 - 8.4.14: Fatal error: Declaration of WrongOriginalImplementor::handle(ChildInterface $a): string must be compatible with OriginalHandlerInterface::handle(ParentInterface $a): string in /in/sZ9XB on line 43
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33: Fatal error: Declaration of ContravariantImplementor::handle(ParentInterface $a): string must be compatible with AnotherHandlerInterface::handle(ChildInterface $a): string in /in/sZ9XB on line 24
Process exited with code 255.

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