How to define constants in php classes

PHP defines constants using the define() method.

Related recommendations: "php Getting Started Tutorial"

define() method has three parameters:

1. The constant name of string type needs to be used Enclosed in double quotes [required parameters].

2. The value of the defined constant [required parameter].

3. Specify whether case is sensitive, true means insensitive, false means sensitive (default is false) [optional parameter].

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