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<?php function &g(&$v) { return $v; } $foo = null; $name = 'foo'; var_dump(g($$name)); var_dump(array(g($$name)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL array(1) { [0]=> NULL }