/**
* Counts the number of substring occurrences.
* @param string $haystack The string being checked.
* @param string $needle The string being found.
* @param string $encoding (optional) The used internally by this function character encoding.
* If it is omitted, the platform character set will be used by default.
* @return int The number of times the needle substring occurs in the haystack string.
* @link http://php.net/manual/en/function.mb-substr-count.php
*/
function api_substr_count($haystack, $needle, $encoding = null)
{
return Utf8::substr_count($haystack, $needle);
}