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run code in 150+ php & hhvm versions
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<?php define("CONSTANT", ...[&$test]); function func($val = CONSTANT) { var_dump($val); } function reffunc(&$val = CONSTANT) { var_dump($val); } func(); reffunc(); $test = 1; func(); reffunc();
Output for 5.6.0 - 5.6.28, 7.0.0 - 7.1.0
NULL NULL NULL NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Constants may only evaluate to scalar values in /in/NYHRf on line 3 Notice: Use of undefined constant CONSTANT - assumed 'CONSTANT' in /in/NYHRf on line 5 string(8) "CONSTANT" Notice: Use of undefined constant CONSTANT - assumed 'CONSTANT' in /in/NYHRf on line 9 string(8) "CONSTANT" Notice: Use of undefined constant CONSTANT - assumed 'CONSTANT' in /in/NYHRf on line 5 string(8) "CONSTANT" Notice: Use of undefined constant CONSTANT - assumed 'CONSTANT' in /in/NYHRf on line 9 string(8) "CONSTANT"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.5.38
Parse error: syntax error, unexpected '.' in /in/NYHRf on line 3
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 '.' in /in/NYHRf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/NYHRf on line 3
Process exited with code 255.