/**
* Determines if a string ends with a specified substring, searching case-insensitively.
*
* As a special case, the method returns `true` if the searched substring is empty.
*
* @param string $withString The searched substring.
*
* @return bool `true` if the string ends with the substring specified, ignoring the letter case of the characters,
* and `false` otherwise.
*/
public function endsWithCi($withString)
{
return CUString::endsWithCi($this, $withString);
}