When stepping through code using the debugger, usually there will be one or more arrays in the code. Oftentimes it would be very helpful to know how many elements are in each array. In the case of PHP indexed arrays, one can simply expand any one of the arrays and scroll down to see the last (and highest) key value. But in the case of associative arrays, there is no way to know the number of elements without manually counting them, which can be very time-consuming for large arrays and essentially impossible for huge ones. It would be wonderful if, when the user hovers his mouse pointer over the name of an array in the Debug panel, a tooltip pops up showing the number of elements in the array.