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<?php $sum = null; // global variable function outer() { global $sum; $hundred_more = 100; $sum = function ($a, $b) use ($hundred_more) { return $a + $b + (++$hundred_more); }; $sum2 = function ($a, $b) use ($hundred_more) { return $a + $b + (++$hundred_more); }; var_dump($hundred_more); } outer(); // define sum at the global scope and print 100 var_dump($sum(5, 10)); // 116 var_dump($sum(5, 10)); // 117 var_dump($sum2(5, 10)); // 116 var_dump($sum2(5, 10)); // 117 outer(); // redefine sum at the global scope and print 100 var_dump($sum(5, 10)); // 116 var_dump($sum(5, 10)); // 117 var_dump($sum2(5, 10)); // 116 var_dump($sum2(5, 10)); // 117
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
int(100) int(116) int(116) Warning: Undefined variable $sum2 in /in/RWUEE on line 19 Fatal error: Uncaught Error: Value of type null is not callable in /in/RWUEE:19 Stack trace: #0 {main} thrown in /in/RWUEE on line 19
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
int(100) int(116) int(116) Notice: Undefined variable: sum2 in /in/RWUEE on line 19 Fatal error: Uncaught Error: Function name must be a string in /in/RWUEE:19 Stack trace: #0 {main} thrown in /in/RWUEE on line 19
Process exited with code 255.
Output for 7.3.32 - 7.3.33
int(100) int(116) int(116) Fatal error: Uncaught Error: Function name must be a string in /in/RWUEE:19 Stack trace: #0 {main} thrown in /in/RWUEE on line 19
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 - 5.6.21
int(100) int(116) int(116) Notice: Undefined variable: sum2 in /in/RWUEE on line 19 Fatal error: Function name must be a string in /in/RWUEE on line 19
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/RWUEE on line 8
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/RWUEE on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/RWUEE on line 8
Process exited with code 255.
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