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<?php class ParentClass { function id() { var_dump(self instanceof ChildClass); } } class ChildClass extends ParentClass { } $x = new ChildClass; $x->id();
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
Fatal error: Uncaught Error: Undefined constant "self" in /in/Yl8ck:6 Stack trace: #0 /in/Yl8ck(16): ParentClass->id() #1 {main} thrown in /in/Yl8ck on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant self - assumed 'self' (this will throw an Error in a future version of PHP) in /in/Yl8ck on line 6 bool(false)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Use of undefined constant self - assumed 'self' in /in/Yl8ck on line 6 bool(false)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/Yl8ck on line 6
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
Parse error: parse error, unexpected T_STRING in /in/Yl8ck on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Yl8ck on line 6
Process exited with code 255.

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