To make things even easier, I put this inside one function in my functions.php so it helps me a lot:
1	<?php
2	    function debug($var) {
3	        if ( ! is_string($var) ) {
4	            echo "<pre>";
5	                print_r($var);
6	            echo "</pre>";
7	        } else {
8	            echo "DEBUG: ".$var;
9	        }
10	    }
11	?>