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<?php $result = 0; $result2 = 1; $one = function() { var_dump($result); }; $two = function() use ($result) { var_dump($result); }; $three = function() use (&$result) { var_dump($result); }; $four = function($result) use (&$result2) { var_dump($result); }; $result++; $one(); // outputs NULL: $result is not in scope $two(); // outputs int(0): $result was copied $three(); // outputs int(1) $four(); ?>
Output for 7.1.0
Notice: Undefined variable: result in /in/eqL5D on line 6 NULL int(0) int(1) Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 0 passed in /in/eqL5D on line 22 and exactly 1 expected in /in/eqL5D:14 Stack trace: #0 /in/eqL5D(22): {closure}() #1 {main} thrown in /in/eqL5D on line 14
Process exited with code 255.
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.0.14
Notice: Undefined variable: result in /in/eqL5D on line 6 NULL int(0) int(1) Warning: Missing argument 1 for {closure}(), called in /in/eqL5D on line 22 and defined in /in/eqL5D on line 14 Notice: Undefined variable: result in /in/eqL5D on line 15 NULL
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined variable: result in /in/eqL5D on line 6 NULL int(0) int(1) Warning: __invoke() expects exactly 1 parameter, 0 given in /in/eqL5D on line 15 Notice: Undefined variable: result in /in/eqL5D on line 15 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/eqL5D on line 5
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/eqL5D on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/eqL5D on line 5
Process exited with code 255.