PHP，OOP，属性[关闭]

Question

Could someone help me make query using php oop, here is what I trying but not work:

$this -> hashs = DB::select('SELECT * FROM'. $this -> table .'WHERE'. $this-> colRep .'IS NULL &&'. $this -> colCol .'= ?', array($this -> commentHASH));

If I use normal variable work fine....

Answer 1

In php . doesn't put a space between the elements you're concatenating. That'd be a start.