Name some of the constants in PHP and their purpose

Below are the name some of the constants  in PHP and their purpose:

1.  _LINE_ – It represents the current line number of the file.
2.  _FILE_ – It represents the full path and filename of the file. If used inside an include,the name of the included file is returned.
3. _FUNCTION_ – It represents the function name.
4. _CLASS_ – It returns the class name as it was declared.
5. _METHOD_ – It represents the class method name.

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