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<?php function g($al = null, $go = null) { $goal = function($al = null, $go = null) use (&$goal) { if (!isset($go)) $go = 'go'; else $go .= 'o'; if (!isset($al)) return function ($al) use (&$go) { return $goal($al, $go); }; return $go.$al; }; return $goal($al, $go); } echo $goal()('al');
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
Warning: Undefined variable $goal in /in/Y6bgu on line 15 Fatal error: Uncaught Error: Value of type null is not callable in /in/Y6bgu:15 Stack trace: #0 {main} thrown in /in/Y6bgu on line 15
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: goal in /in/Y6bgu on line 15 Fatal error: Uncaught Error: Function name must be a string in /in/Y6bgu:15 Stack trace: #0 {main} thrown in /in/Y6bgu on line 15
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Function name must be a string in /in/Y6bgu:15 Stack trace: #0 {main} thrown in /in/Y6bgu on line 15
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/Y6bgu on line 15
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_FUNCTION in /in/Y6bgu on line 5
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_FUNCTION in /in/Y6bgu on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Y6bgu on line 5
Process exited with code 255.

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