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How does PHP handle reference data types and copying of arrays when passed to functions?

When passing arrays to functions in PHP, they are typically passed by value, meaning a copy of the array is made. However, if you want to pass an array by reference to a function and have the function modify the original array, you can use the `&` symbol in the function parameter declaration.

php 
// Passing array by reference to a function
function modifyArray(&$arr) {
    $arr[0] = "modified";
}

$myArray = ["original", "value"];
modifyArray($myArray);

print_r($myArray); // Output: Array ( [0] => modified [1] => value )

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