PHP CONSTANTS
In PHP, a constant is an identifier (name) for a simple value that cannot be changed during the execution of a script. Once a constant is defined, its value cannot be altered or redefined. PHP constants are useful for storing values that do not change, such as configuration settings or mathematical constants.
To define a constant in PHP, you can use the define() function, which takes two arguments: the name of the constant and its value.
E.g:
define("PI", 3.14159);
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