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<?php $array = [ 'foo' => [ 'bar' => [ 'baz' => 'bat'] ] ]; $obj = new ArrayObject($array); $cb = function($obj) { $obj['foo']['bar'] = 'bazbat'; }; print_r($obj); $cb($obj); print_r($obj); $obj->foo = 'bar'; print_r($obj); print_r((array)$obj);
Output for git.master, git.master_jit, rfc.property-hooks
ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => Array ( [baz] => bat ) ) ) ) ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Deprecated: Creation of dynamic property ArrayObject::$foo is deprecated in /in/lS9sI on line 15 ArrayObject Object ( [foo] => bar [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Array ( [foo] => Array ( [bar] => bazbat ) )

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