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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; $f3 = function() use ($zero, $one, $two) { $three = 3; // first-level closure scope of f4 $f4 = function() use ($zero, $one, $two, $three) { $four = 4; // local scope of f4 var_dump($zero + $one + $two + $three + $four); }; $f4(); }; }; }; $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
1 Warning: Undefined variable $f2 in /in/0v2Aq on line 22 Fatal error: Uncaught Error: Value of type null is not callable in /in/0v2Aq:22 Stack trace: #0 {main} thrown in /in/0v2Aq on line 22
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 - 7.3.31, 7.4.0 - 7.4.33
1 Notice: Undefined variable: f2 in /in/0v2Aq on line 22 Fatal error: Uncaught Error: Function name must be a string in /in/0v2Aq:22 Stack trace: #0 {main} thrown in /in/0v2Aq on line 22
Process exited with code 255.
Output for 7.3.32 - 7.3.33
1 Fatal error: Uncaught Error: Function name must be a string in /in/0v2Aq:22 Stack trace: #0 {main} thrown in /in/0v2Aq on line 22
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 - 5.6.40
1 Notice: Undefined variable: f2 in /in/0v2Aq on line 22 Fatal error: Function name must be a string in /in/0v2Aq on line 22
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/0v2Aq 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/0v2Aq on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0v2Aq on line 4
Process exited with code 255.
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