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copied!<p>Nope, casting just results in a normal PHP array -- losing whatever functionality your ArrayObject-derived class had. Check this out:</p> <pre><code>class CaseInsensitiveArray extends ArrayObject { public function __construct($input = array(), $flags = 0, $iterator_class = 'ArrayIterator') { if (isset($input) && is_array($input)) { $tmpargs = func_get_args(); $tmpargs[0] = array_change_key_case($tmpargs[0], CASE_LOWER); return call_user_func_array(array('parent', __FUNCTION__), $tmp args); } return call_user_func_array(array('parent', __FUNCTION__), func_get_args()); } public function offsetExists($index) { if (is_string($index)) return parent::offsetExists(strtolower($index)); return parent::offsetExists($index); } public function offsetGet($index) { if (is_string($index)) return parent::offsetGet(strtolower($index)); return parent::offsetGet($index); } public function offsetSet($index, $value) { if (is_string($index)) return parent::offsetSet(strtolower($index, $value)); return parent::offsetSet($index, $value); } public function offsetUnset($index) { if (is_string($index)) return parent::offsetUnset(strtolower($index)); return parent::offsetUnset($index); } } $blah = new CaseInsensitiveArray(array( 'A'=>'hello', 'bcD'=>'goodbye', 'efg'=>'Aloha', )); echo "is array: ".is_array($blah)."\n"; print_r($blah); print_r(array_keys($blah)); echo $blah['a']."\n"; echo $blah['BCD']."\n"; echo $blah['eFg']."\n"; echo $blah['A']."\n"; </code></pre> <p>As expected, the array_keys() call fails. In addition, is_array($blah) returns false. But if you change the constructor line to:</p> <pre><code>$blah = (array)new CaseInsensitiveArray(array( </code></pre> <p>then you just get a normal PHP array (is_array($blah) returns true, and array_keys($blah) works), but all of the functionality of the ArrayObject-derived subclass is lost (in this case, case-insensitive keys no longer work). Try running the above code both ways, and you'll see what I mean.</p> <p>PHP should either provide a native array in which the keys are case-insensitive, or make ArrayObject be castable to array without losing whatever functionality the subclass implements, or just make all array functions accept ArrayObject instances.</p>

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