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<?php function makeLouder($fn) { return function($a) use($fn) { return $fn($a)."!!!"; }; } $foo = makeLouder(abs()); echo "<p>".$foo(900)."<br/>".$foo(-900); $bar = makeLouder(strtoupper()); echo "<p>".$bar("upper");
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 ArgumentCountError: abs() expects exactly 1 argument, 0 given in /in/2EkTX:7 Stack trace: #0 /in/2EkTX(7): abs() #1 {main} thrown in /in/2EkTX on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: abs() expects exactly 1 parameter, 0 given in /in/2EkTX on line 7 Fatal error: Uncaught Error: Function name must be a string in /in/2EkTX:4 Stack trace: #0 /in/2EkTX(8): {closure}(900) #1 {main} thrown in /in/2EkTX on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Warning: abs() expects exactly 1 parameter, 0 given in /in/2EkTX on line 7 Fatal error: Function name must be a string in /in/2EkTX on line 4
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/2EkTX 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_FUNCTION in /in/2EkTX on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/2EkTX on line 3
Process exited with code 255.

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