Overview

PADLEFT command will construct a new string based on the arguments inputs, input 1 is the original string, input 2 an integer to denote how many characters the pad left will construct, input 3 is the string that will fill in the gap with character that are remaining before the input 1 string.
In the below example, and integer is read from TestInteger, PADLEFT will then add the 0's to the left of the integer to create a 5 character string e.g.
TestInteger = 12, PADLEFT outputs 00012.
TestInteger = 12435, PADLEFT outputs 12435.