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<?php echo Module::work('hello world'), "\n"; abstract class Module { public static function work($it) { $module = 'self'; return $module::strtoupper($it); } private static function strtoupper($it) { return strtoupper($it); } }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Class "self" not found in /in/5J8WH:8 Stack trace: #0 /in/5J8WH(2): Module::work('hello world') #1 {main} thrown in /in/5J8WH on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Class 'self' not found in /in/5J8WH:8 Stack trace: #0 /in/5J8WH(2): Module::work('hello world') #1 {main} thrown in /in/5J8WH on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28
Fatal error: Class 'self' not found in /in/5J8WH on line 8
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /in/5J8WH on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /in/5J8WH on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/5J8WH on line 4
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_CLASS in /in/5J8WH on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/5J8WH on line 4
Process exited with code 255.

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