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<?php class Foo { public static function bar() : self { return self; } } class Foo2 extends Foo {} var_dump(Foo2::bar());
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/hEkco:7 Stack trace: #0 /in/hEkco(12): Foo::bar() #1 {main} thrown in /in/hEkco on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 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/hEkco on line 7 Fatal error: Uncaught TypeError: Return value of Foo::bar() must be an instance of Foo, string returned in /in/hEkco:7 Stack trace: #0 /in/hEkco(12): Foo::bar() #1 {main} thrown in /in/hEkco on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Use of undefined constant self - assumed 'self' in /in/hEkco on line 7 Fatal error: Uncaught TypeError: Return value of Foo::bar() must be an instance of Foo, string returned in /in/hEkco:7 Stack trace: #0 /in/hEkco(12): Foo::bar() #1 {main} thrown in /in/hEkco on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/hEkco on line 5
Process exited with code 255.

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