This command will empty the contents of any array. The array will read as having absolutely no items, and an array size of zero. When an array is completely empty, it will return a count of -1. The count refers to the number of available indexes, and so will return a count of zero when the command DIM arr(0) is used, representing the fact a single subscript is available at index zero.

Syntax: 
EMPTY ARRAY Array Name(0)