Online PHP editor | output for gkji8

@ 2016-04-22T12:57:39Z

<?php

interface Common { function createCommon(); }
interface Specific1 extends Common { function createSpecific1(); }
interface Specific2 extends Common { function createSpecific2(); }

class A implements Specific1, Common
{
    public function createCommon() { }
    public function createSpecific1() { }
}

print_r(class_implements(new A()));

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5: Array ( [Specific1] => Specific1 [Common] => Common )
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: Fatal error: Class A cannot implement previously implemented interface Common in /in/gkji8 on line 7
Process exited with code 255.
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.28: Fatal error: Class A cannot implement previously implemented interface Common in /in/gkji8 on line 8
Process exited with code 255.

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