Are there any specific cases where str_replace may fail with MultiByte characters in PHP?

When using `str_replace` with MultiByte characters in PHP, it may fail if the MultiByte extension is not enabled or if the characters are not properly encoded. To ensure that `str_replace` works correctly with MultiByte characters, you should use the `mb_str_replace` function instead, which is specifically designed to handle MultiByte strings.

function mb_str_replace($search, $replace, $subject) {
    return implode($replace, mb_split($search, $subject));
}