I have a function that takes a variable number of arguments and uses func_get_args to retrieve them as an array. In  one place when I call this function with two arguments a third, empty argument is added. As the function is used to generate SQL 'where' clauses by joing strings with ' and ', this caused a sever problem to my system!  I have added an explicit test for null strings in the function and this has worked round the problem.  I use this function in many places in my code and only this one call has problems. Here is the function, you can see the work round code I added.

    function dband()
    {
             $args = func_get_args();
           $str = jval(array_shift($args));
	         foreach ($args as $v)
	         {
 #        	    if ($v != '')
 #       	    { 
	                  $str .= ' and '.jval($v); 
	#            }
	      }
     	return $str;
    }

I had another version of this function that tried to use array functions to achieve this result but I could not get it to work reliably, but for reasons other than extra arguments.