Class constants

PHP class constants are fixed values that are defined at the class level and remain the same throughout the execution of the program. They are declared using the “const” keyword within a class, and unlike class properties, they cannot be changed or redefined at runtime.

Class constants are useful for defining values that are used repeatedly throughout the class, such as error codes, database table names, or configuration settings. They can also improve code readability and reduce the risk of errors by providing a clear and consistent way to reference important values within the class.

To access a class constant from outside the class, you need to use the scope resolution operator (::) followed by the class name and the constant name. For example, if you have a class called “User” with a constant called “DEFAULT_ROLE”, you can access it using “User::DEFAULT_ROLE”. Overall, PHP class constants are a useful feature for organizing and structuring your code, and can help make it more maintainable and easier to read.