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run code in 150+ php & hhvm versions
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<?php function foo(&$x) {var_dump($x);} function bar($x){var_dump($x);} bar($bar='test0'); var_dump($bar); foo(@$foo='test1'); var_dump($foo);
Output for 7.0.0 - 7.1.0
string(5) "test0" string(5) "test0" Notice: Only variables should be passed by reference in /in/vWLrM on line 8 string(5) "test1" string(5) "test1"
Output for hhvm-3.12.0
string(5) "test0" string(5) "test0" Strict Warning: Only variables should be passed by reference in /in/vWLrM on line 8 string(5) "test1" string(5) "test1"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.2 - 5.6.28
string(5) "test0" string(5) "test0" Strict Standards: Only variables should be passed by reference in /in/vWLrM on line 8 string(5) "test1" string(5) "test1"
Output for 4.3.0 - 5.1.1
string(5) "test0" string(5) "test0" string(5) "test1" string(5) "test1"