How to Increment or Decrement String in PHP - str_increment() and str_decrement() Functions

PHP String Functions

The str_increment() function Increments an alphanumeric string and str_decrement() decrements an alphanumeric string.

Syntax

str_increment(string $string)
str_decrement(string $string)

Examples

Example 1: Basic Increment

echo str_increment('ABC');

Output: ABD

Example 2: Increment with Carry

echo str_increment('PZ');

Output: QA

Example 3: Decrement

echo str_increment('ABC');

Output: ABB