php keyword density function

Hi, need a function/set of functions/class that returns an array of density words from a given url. Function will receive following parameters: -url (given url) -min lenght words (minimun lenght of words to be checked) -min number of words (minimun number of word set to be checked) -max number of words (maximun number of word set to be checked) And must return an array in this way $result[1]= array ('test', 5, 17.8); $result[1]= ... $result[2]= array ('a test', 3, 6.2); ... $result[N] Where $result index represent number of words, first array value the keyword, second value number of ocurrences and third value percentage. Script must not filter special characters like áËñ or others common in any language. Need this script today. Maximun budget $50 Thanks