The result is a Number, which is the number of display cells String {string} occupies. A Tab character is counted as one cell, alternatively use strdisplaywidth(). When {string} contains characters with East Asian Width Class Ambiguous, this function's return value depends on 'ambiwidth'. Returns zero on error. Also see strlen(), strdisplaywidth() and strchars().

Can also be used as a method:

GetString()->strwidth()