Description:
------------
If an argument that is not an array or null is passed as the $params (also called $ctor_params in source code) argument in mysql_fetch_object then the below uncaught exception is returned instead of a normal warning. 
The reproduced code below is similar to that of a test case from 5.3, although by the time that what I have described above was tested no more rows were in $res so bool(false) was being returned and so this problem may also be in 5.3

Reproduce code:
---------------
<?php
//select database and table...

$res = mysql_query('SELECT col1 FROM test');

class mysql_fetch_object_test {
	public $a = null;
	public $b = null;
	public function __construct($a, $b) {
		$this->a = $a;
		$this->b = $b;
	}
	public function toString() {
		var_dump($this);
	}
}
var_dump(mysql_fetch_object($res, 'mysql_fetch_object_test', 'not array'));
?>

Actual result:
--------------
Fatal error: Uncaught exception 'Exception' with message 'Parameter ctor_params must be an array' in ...\mysql_fetch_object.php:25
Stack trace:
#0 ...\mysql_fetch_object.php(25): mysql_fetch_object(Resource id #5, 'mysql_fetch_obj...', 'not array')
#1 {main}
  thrown in ...\mysql_fetch_object.php on line 25