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<?php $array = array(1,2,3,4,5,6,7,8,9); $callback = function($element){ echo($element); }; function walk($a, $index, $callback){ if (count($a) == $index + 1) { $callback($a[$index]); } else { $callback($a[$index]); walk($a, $index + 1); } } walk($array,0, $callback);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
1 Fatal error: Uncaught ArgumentCountError: Too few arguments to function walk(), 2 passed in /in/UU9VZ on line 19 and exactly 3 expected in /in/UU9VZ:9 Stack trace: #0 /in/UU9VZ(19): walk(Array, 1) #1 /in/UU9VZ(25): walk(Array, 0, Object(Closure)) #2 {main} thrown in /in/UU9VZ on line 9
Process exited with code 255.
Output for 7.0.0 - 7.0.33
1 Warning: Missing argument 3 for walk(), called in /in/UU9VZ on line 19 and defined in /in/UU9VZ on line 9 Notice: Undefined variable: callback in /in/UU9VZ on line 17 Fatal error: Uncaught Error: Function name must be a string in /in/UU9VZ:17 Stack trace: #0 /in/UU9VZ(19): walk(Array, 1) #1 /in/UU9VZ(25): walk(Array, 0, Object(Closure)) #2 {main} thrown in /in/UU9VZ on line 17
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 Warning: Missing argument 3 for walk(), called in /in/UU9VZ on line 19 and defined in /in/UU9VZ on line 9 Notice: Undefined variable: callback in /in/UU9VZ on line 17 Fatal error: Function name must be a string in /in/UU9VZ on line 17
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/UU9VZ on line 5
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/UU9VZ on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UU9VZ on line 5
Process exited with code 255.
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