Object Nuking via $this re-assignment

Just an observation: I recently stumbled upon this interesting (to me anyways) piece of information while writing a class in PHP that accesses a MySQL database. I made a class and a few methods similar to the following: class myClass { var $field1, $field2; function myClass ($id) { $result = mysql_query ("SELECT field1, field2 FROM table WHERE id=$id"); $this = mysql_fetch_object ($result); } function myMethod() { echo "Field 1: $this->field1"; } } My intent was to assign the result from the query of field1 and field2 to $this->field1 and $this->field2, thereby making a shortcut of my previous ways of returning the result to $obj and assigning each variable by $this->field1 = $obj->field1. I've since changed my ways and created a var $db, and assign to it the result from a mysql_fetch_array($result) call. After figuring out why I was getting fatal errors b/c my methods weren't accessible, I was curious why PHP would allow me to do such a thing. Outside of the class, object reassignment makes sense, but I would at least expect a warning when trying to remap $this from within the object itself. -Rob.