note 104296 added to language.oop5.overloading

You should take care when using properties retrieved via __get() in functions that expect arguments to be passed by reference (e.g. mysqli_stmt_bind_param). The reference is NOT set to the property itself, but to the value returned by __get(). Thus, binding a property retrieved via __get() to a statement will let the statement be executed always with the value the property had when calling bind_param, not with the current value it has when calling execute(). E.g.: <?php error_reporting(E_ALL); class foo { protected $bar; public function __construct() { $this->bar = "Hello World!"; } public static function factory() { return new self; } public function __get($property) { if(!property_exists($this,$property)) { throw new InvalidArgumentException("Property {$property} doesn't exist"); } return $this->$property; } public function setBar($value) { $this->bar = $value; } } $foo = new foo(); echo $foo->bar; // Ouputs: Hello World! $db = new mysqli("localhost","root","","tests"); $sql = "INSERT INTO foo SET bar=?"; $res = $db->prepare($sql); $res->bind_param("s",$foo->bar); // Notice: Indirect modification of overloaded property foo::$bar has no effect in /var/www/overload.php on line 24 $res->execute(); // Writes "Hello World!" to database $foo->setBar("Goodbye"); echo $foo->bar; // Outputs: Goodbye $res->execute(); // Writes "Hello World!" to database ?> ---- Server IP: 69.147.83.197 Probable Submitter: 79.194.68.100 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.overloading.php Edit -- https://master.php.net/note/edit/104296 Del: integrated -- https://master.php.net/note/delete/104296/integrated Del: useless -- https://master.php.net/note/delete/104296/useless Del: bad code -- https://master.php.net/note/delete/104296/bad+code Del: spam -- https://master.php.net/note/delete/104296/spam Del: non-english -- https://master.php.net/note/delete/104296/non-english Del: in docs -- https://master.php.net/note/delete/104296/in+docs Del: other reasons-- https://master.php.net/note/delete/104296 Reject -- https://master.php.net/note/reject/104296 Search -- https://master.php.net/manage/user-notes.php