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<?php $zero = 0; // global scope $f1 = function() use ($zero) { $one = 1; // third-level closure scope of f4 echo $one; $f2 = function() use ($zero, $one) { $two = 2; // second-level closure scope of f4 echo $one + $two; $f3 = function() use ($zero, $one, $two) { $three = 3; // first-level closure scope of f4 echo $zero + $one + $two + $three; $f4 = function() use ($zero, $one, $two, $three) { $four = 4; // local scope of f4 var_dump($zero + $one + $two + $three + $four); }; $f4(); }; $f3(); }; $f2(); }; $f1(); $f2();
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
136int(10) Warning: Undefined variable $f2 in /in/KhXog on line 25 Fatal error: Uncaught Error: Value of type null is not callable in /in/KhXog:25 Stack trace: #0 {main} thrown in /in/KhXog on line 25
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, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
136int(10) Notice: Undefined variable: f2 in /in/KhXog on line 25 Fatal error: Uncaught Error: Function name must be a string in /in/KhXog:25 Stack trace: #0 {main} thrown in /in/KhXog on line 25
Process exited with code 255.
Output for 7.3.32 - 7.3.33
136int(10) Fatal error: Uncaught Error: Function name must be a string in /in/KhXog:25 Stack trace: #0 {main} thrown in /in/KhXog on line 25
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, 5.6.7 - 5.6.28
136int(10) Notice: Undefined variable: f2 in /in/KhXog on line 25 Fatal error: Function name must be a string in /in/KhXog on line 25
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/KhXog 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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/KhXog on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/KhXog on line 4
Process exited with code 255.
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