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run code in 150+ php & hhvm versions
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<?php $func = function &() { return 'ampersand'; }; var_dump($func());
based on fGbM3
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Only variable references should be returned by reference in /in/JB2He on line 4 string(9) "ampersand"
Output for hhvm-3.12.0
string(9) "ampersand"
Output for hhvm-3.10.0

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/JB2He 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 T_FUNCTION in /in/JB2He on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/JB2He on line 3
Process exited with code 255.