How can you determine the encoding used in passing strings between PHP scripts?

To determine the encoding used in passing strings between PHP scripts, you can use the `mb_detect_encoding()` function in PHP. This function detects the encoding of a string by checking for byte order marks or using heuristics. By using this function, you can ensure that the correct encoding is being used when passing strings between PHP scripts.

$string = "Hello, 你好, Привет";
$encoding = mb_detect_encoding($string);
echo "The encoding of the string is: " . $encoding;