note 81006 added to language.oop5.overloading

Several users have mentioned ways to allow setting of array properties via magic methods. In particular, PHP calls the __get() method instead of the __set() method when you try to do: $obj->prop['offset'] = $val. The suggestions that I've read below all work, except that they do not allow you make properties read-only. After a bit of struggling, I have found a solution. Essentially, if the property is supposed to be a read-only array, create an new ArrayObject() out of it, then clone it and return the clone. <?php public function __get($var) { if(isset($this->read_only_props[$var])) { $ret = null; if (is_array($this->read_only_props[$var])) return clone new ArrayObject($this->read_only_props[$var]); else if (is_object($this->read_only_props[$var])) return clone $this->read_only_props[$var]; else return $this->read_only_props[$var]; } else if (!isset($this->writeable_props[$var])) $this->writeable_props[$var] = NULL; return $this->writeable_props[$var]; } public function __set($var, $val) { if (isset($this->read_only_props[$var])) throw new Exception('tried to set a read only property on the event object'); return $this->writeable_props[$var] = $val; } ?> Note that __get() does not explicitly return by reference as many examples have suggested. Also, I have not found a way to detect when __get() is being called for setting purposes, thus my code can not throw an exception when necessary in these cases. ---- Server IP: 209.41.74.194 Probable Submitter: 24.218.222.170 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.overloading.php Edit -- https://master.php.net/note/edit/81006 Del: integrated -- https://master.php.net/note/delete/81006/integrated Del: useless -- https://master.php.net/note/delete/81006/useless Del: bad code -- https://master.php.net/note/delete/81006/bad+code Del: spam -- https://master.php.net/note/delete/81006/spam Del: non-english -- https://master.php.net/note/delete/81006/non-english Del: in docs -- https://master.php.net/note/delete/81006/in+docs Del: other reasons-- https://master.php.net/note/delete/81006 Reject -- https://master.php.net/note/reject/81006 Search -- https://master.php.net/manage/user-notes.php