/**
* Replaces all occurrences of a substring in a string with a specified string, searching case-insensitively, and
* returns the new string, optionally reporting the number of replacements made.
*
* @param string $what The searched substring.
* @param string $with The replacement string.
* @param reference $quantity **OPTIONAL. OUTPUT.** After the method is called with this parameter provided, the
* parameter's value, which is of type `int`, indicates the number of replacements made.
*
* @return CUStringObject The resulting string.
*/
public function replaceCi($what, $with, &$quantity = null)
{
return CUString::replaceCi($this, $what, $with, $quantity);
}