Possible Bug with Interface, Constants and Inheritance

Hi, I'm not sure if it's a bug or not. Consider these simple script: <?php interface I1 { const C1 = '';} class C3 implements I1 { const C1 = 'c2';} $c3 = new C3; var_dump($c3::C1); That gives a fatal error with mod_php and PHP CLI if I call the CLI version with a file name: PHP Fatal error: Cannot inherit previously-inherited or override constant C1 from interface I1 in If I use the CLI and enter the code directly it works: ~> php -v PHP 7.0.7 (cli) (built: May 27 2016 15:22:32) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies ~> php -a -ddispplay_errors=On Interactive shell php > interface I1 { const C1 = '';} php > class C3 implements I1 { const C1 = 'c2';} php > $c3 = new C3; php > var_dump($c3::C1); string(2) "c2" Is this always the correkt behaviour? KP