Checking if array is multidimensional or not?

Question

1. What is the most efficient way to check if an array is a flat array of primitive values or if it is a multidimensional array?

Answer 1

You can simply execute this:

if (count($myarray) !== count($myarray, COUNT_RECURSIVE)) return true;
else return false;

If the optional mode parameter is set to COUNT_RECURSIVE (or 1), count() will recursively count the array. This is particularly useful for counting all the elements of a multidimensional array.

If it's the same, means there are no sublevels anywhere. Easy and fast!