Constants in PHP

The value of PI is 3.14159

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Constants in PHP are like variables, but their values cannot be changed once they are defined. They are useful for storing values that are fixed and will not change throughout the execution of the script.

Unlike variables, constants are defined using the define() function and are accessed using their names without the $ prefix.

Constants provide a way to define meaningful names for values that are used repeatedly throughout a script, making the code more readable and maintainable.