Question:What is constant? How can you declare a constant?
Answer A constant is a value that cannot be modified throughout the execution of a program. Constants are particularly useful when working with values that definitely will not require modification, such as Pi (3.141592). Once a constant has been defined, it cannot be changed (or redefined) at any other point of the program. Constants are defined using the define() function in php.
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What is constant? How can you declare a constant?