3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function &test($a) { $empty = []; return isset($a) ? $a : $empty; } function &test2($a) { $empty = []; return ${isset($a) ? 'a' : 'empty'}; } $test =& test('123'); print_r($test); $test =& test2('123'); print_r($test); $test =& test(NULL); print_r($test); $test =& test2(NULL); print_r($test);
based on WGB2f
Output for 5.4.0 - 7.2.0
Notice: Only variable references should be returned by reference in /in/42Cq9 on line 5 123123 Notice: Only variable references should be returned by reference in /in/42Cq9 on line 5 Array ( ) Array ( )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/42Cq9 on line 4
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/42Cq9 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/42Cq9 on line 4
Process exited with code 255.