How can PHP functions be defined for repeated use, and why are parameters necessary in the function definition?

To define PHP functions for repeated use, you can create a function using the `function` keyword followed by the function name and its parameters. Parameters are necessary in the function definition to allow the function to accept input values that can be used within the function body. This allows for the function to be more versatile and reusable with different input values. 

// Define a function to calculate the square of a number
function calculateSquare($num) {
    return $num * $num;
}

// Call the function with a parameter
echo calculateSquare(5); // Output: 25

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PHP functions defined repeated use parameters function definition

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