PHP Constant
In PHP, a constant is an identifier (name) for a simple value that cannot be changed or redefined during the execution of a script. Unlike variables, constants do not use a dollar sign ($) and are automatically global across your entire application.
Constant vs. Variable
| Feature | Constant | Variable |
|---|---|---|
| Syntax | No $ sign (e.g., NAME) | Starts with $ (e.g., $name) |
| Value | Fixed | Changeable |
| Scope | Always Global | Local by default |
| Assignment | Via define() or const | Via = operator |
To create a Constant, the syntax is:
Define(name, value, case-insensitive)