constructing class

Hi, I want to create an instance of a class and construct it with different params. The class name is a variable and the params change in each class. Is there a way to pass params to the constructor of a class like you pass params in the function call_user_func_array() ? BTW, there's a solution for it using eval, but looking for a better cleaner way... With eval: $cls="MyClass"; $construct_params=array(10,true); $eval_str="return new $cls("; for ($i=0; $i<count($construct_params); $i++) $eval_str.="\$construct_params[$i],"; $eval_str=substr($eval_str,-1).");"; $obj=eval($eval_str); thanks in advance, Lorderon.