3v4l.org

run code in 150+ php & hhvm versions
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<?php $sum; // global variable function outer() { $hundred_more = 100; $sum = function ($a, $b) { return $a + $b + (++$hundred_more); }; echo $hundred_more; } outer(); // define sum at the global scope and print 100 echo($sum(5, 10)); // 116 echo($sum(5, 10)); // 117 outer(); // redefine sum at the global scope and print 100 echo($sum(5, 10)); // 116 echo($sum(5, 10)); // 117
based on 4lZWP
Output for 7.0.0 - 7.1.0
100 Notice: Undefined variable: sum in /in/m8Vf5 on line 13 Fatal error: Uncaught Error: Function name must be a string in /in/m8Vf5:13 Stack trace: #0 {main} thrown in /in/m8Vf5 on line 13
Process exited with code 255.
Output for 5.3.0 - 5.6.28
100 Notice: Undefined variable: sum in /in/m8Vf5 on line 13 Fatal error: Function name must be a string in /in/m8Vf5 on line 13
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/m8Vf5 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/m8Vf5 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/m8Vf5 on line 7
Process exited with code 255.