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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 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
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" } }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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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