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<?php class Foo { } function deleteMe(&$obj) { $obj = (unset) $obj; } $foo = new Foo(); var_dump($foo); deleteMe($foo); var_dump($foo); debug_zval_dump($foo);
Output for 7.2.0 - 7.3.0rc4
Deprecated: The (unset) cast is deprecated in /in/b8NuF on line 9 object(Foo)#1 (0) { } NULL NULL
Output for 7.0.0 - 7.1.20
object(Foo)#1 (0) { } NULL NULL
Output for 5.0.0 - 5.6.28
object(Foo)#1 (0) { } NULL NULL refcount(2)
Output for 4.3.0 - 4.4.9
object(foo)(0) { } NULL NULL refcount(2)