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<?php namespace Interfaces; interface FeelingsInterface { } namespace \Std; class Human { } class Animal { } class Person extends Human implements Interfaces\FeelingsInterface { } class Dog extends Animal implements Interfaces\FeelingsInterface { } $me = new Person(); $dog = new Dog(); var_dump(class_implements($me)); var_dump(class_implements($dog));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Parse error: syntax error, unexpected fully qualified name "\Std", expecting "{" in /in/qhbZU on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Undefined constant 'Interfaces\Std' in /in/qhbZU:6 Stack trace: #0 {main} thrown in /in/qhbZU on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Fatal error: Undefined constant 'Interfaces\Std' in /in/qhbZU on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/qhbZU on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/qhbZU on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/qhbZU on line 2
Process exited with code 255.

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