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<?php namespace NS; class Foo { static function bar() { echo __METHOD__, PHP_EOL; } } $f = Foo::__CLASS__ . "::bar"; var_dump(is_callable($f));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Undefined constant NS\Foo::__CLASS__ in /in/tOUBA:11 Stack trace: #0 {main} thrown in /in/tOUBA on line 11
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Undefined class constant '__CLASS__' in /in/tOUBA:11 Stack trace: #0 {main} thrown in /in/tOUBA on line 11
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '__CLASS__' (T_CLASS_C) in /in/tOUBA on line 11
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '__CLASS__' (T_CLASS_C), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/tOUBA on line 11
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_CLASS_C, expecting T_STRING or T_VARIABLE or '$' in /in/tOUBA on line 11
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/tOUBA on line 3
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/tOUBA on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/tOUBA on line 3
Process exited with code 255.

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