/**
* Returns a substring from a string, with both starting and ending positions specified.
*
* As a special case, the method returns an empty string if the starting and ending positions are the same, with
* the greatest such position being the string's length.
*
* @param int $startPos The position of the substring's first character.
* @param int $endPos The position of the character that *follows* the last character in the substring.
*
* @return CUStringObject The substring.
*/
public function substring($startPos, $endPos)
{
return CUString::substring($this, $startPos, $endPos);
}