What is the best way to create functions in PHP that can have an indefinite number of parameters?

When you want to create a function in PHP that can accept an indefinite number of parameters, you can use the `func_get_args()` function to retrieve all the arguments passed to the function as an array. This allows you to work with a variable number of parameters without having to define each one explicitly in the function definition.

function sum(...$numbers) {
    return array_sum($numbers);
}

echo sum(1, 2, 3, 4, 5); // Output: 15