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<?php class Foo { } function deleteMe(&$obj) { $obj = (unset) $obj; } $foo = new Foo(); var_dump($foo); deleteMe($foo); var_dump($foo);
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
object(Foo)#1 (0) { } NULL
Output for 4.3.0 - 4.4.9
object(foo)(0) { } NULL