Questions about loads, architecture of new services (calculation sheets and tariffs) — how do you perceive this?

In PHP, to pass an array to a function without modifying its contents, pass it by value, i.e., without using a reference. By default, arrays in PHP are passed to functions by copying, so changes inside the function do not affect the original array.

Example:

function processArray(array $arr) {
    $arr[] = 'new element'; // modifying the local copy
    print_r($arr);
}

$original = ['a', 'b', 'c'];
processArray($original);
print_r($original); // the original array remains unchanged

If you pass the array by reference (using &), then changes inside the function will affect the original array.