PHP Constants
A constant is an identifier (name) for a simple value. The value cannot be
changed during the script.just use the constant name and user everywhere in the same file.
A valid constant name starts with a letter or underscore.
Note: Unlike variables, constants are automatically global across the entire
script.
Create a PHP Constant
To create a constant, use the define() function.
Syntax
define(name, value, case-insensitive)
Parameters:
name: Specifies the name of the constant
value: Specifies the value of the constant
case-insensitive: Specifies whether the constant name should be caseinsensitive.
Default is false
Example
The example below.
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