PHP ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits. *With user input ($pinNumbers), create a function that takes a string and returns true if the PIN is valid and false if it's not. Examples validatePIN("$1234") ➞ true validatePIN("12345") ➞ false validatePIN("a234") ➞ false validatePIN("") ➞ false Notes ● Some test cases contain special characters. ● Empty strings must return false.

C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter15: Recursion
Section: Chapter Questions
Problem 20PE
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PHP

ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4
digits or exactly 6 digits.
*With user input ($pinNumbers), create a function that takes a string and returns true if the
PIN is valid and false if it's not.
Examples
validatePIN("$1234") ➞ true
validatePIN("12345") ➞ false
validatePIN("a234") ➞ false
validatePIN("") ➞ false
Notes
● Some test cases contain special characters.
● Empty strings must return false.
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