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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 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => Array ( [baz] => bat ) ) ) ) ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Fatal error: Uncaught Error: Undefined constant "bar" in /in/UpXPc:15 Stack trace: #0 {main} thrown in /in/UpXPc on line 15
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => Array ( [baz] => bat ) ) ) ) ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Warning: Use of undefined constant bar - assumed 'bar' (this will throw an Error in a future version of PHP) in /in/UpXPc on line 15 ArrayObject Object ( [foo] => bar [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Array ( [foo] => Array ( [bar] => bazbat ) )
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => Array ( [baz] => bat ) ) ) ) ArrayObject Object ( [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Notice: Use of undefined constant bar - assumed 'bar' in /in/UpXPc on line 15 ArrayObject Object ( [foo] => bar [storage:ArrayObject:private] => Array ( [foo] => Array ( [bar] => bazbat ) ) ) Array ( [foo] => Array ( [bar] => bazbat ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/UpXPc on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/UpXPc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UpXPc on line 3
Process exited with code 255.

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