How to Define Constant in PHP - Learn Beginner Level PHP 2021

How to Define Constant in PHP - Learn Beginner Level PHP 2021

Constants are like variable that once they are defined they can not
be changed or undefined.
PHP Constants
A constant is an identifier (name) for a simple value. The value cannot be
changed during the script.
A valid constant name starts with a letter or underscore (no $ sign before the
constant name).
constants are automatically global across the entire
script.

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