str_replace function for PAWN

stock str_replace(const needle[], const replace[], haystack[], bool:ignorecase = true, needlen = sizeof(needle), haylen = sizeof(haystack))
{
    new
        count,
        index = strfind(haystack, needle, ignorecase);

    while(index != -1)
    {
        strdel(haystack, index, index + (needlen - 1));
        strins(haystack, replace, index, haylen);

        index = strfind(haystack, needle, ignorecase);
        count++;
    }
    return count;
}