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<?php class Foo { public $bar = ""; } $foos = ['a' => new Foo()]; $foos['b'] = &$foos['a']; function modifyFoos(array $foos) { $foos['a']->bar = "bar"; } modifyFoos($foos); var_dump($foos); function modifyFoosHandlingReferencesIncorrectly(array $foos) { foreach ($foos as $key => $val) { $foos[$key] = clone $val; } $foos['a']->bar = "baz"; var_dump($foos); } modifyFoosHandlingReferencesIncorrectly($foos); var_dump($foos); function modifyFoosHandlingReferences(array $foos) { $oldFoos = $foos; $foos = []; foreach ($oldFoos as $key => $val) { $foos[$key] = clone $val; } $foos['a']->bar = "barbaz"; } modifyFoosHandlingReferences($foos); var_dump($foos);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["a"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "bar" } ["b"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "bar" } } array(2) { ["a"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } ["b"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } } array(2) { ["a"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } ["b"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } } array(2) { ["a"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } ["b"]=> &object(Foo)#1 (1) { ["bar"]=> string(3) "baz" } }

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