<?php
 
	/*
	* Returns the most repetead words (llonger than $long)
	* given in a string
	*@author MadPitbull
	*/
	function kWords($txt, $lim, $long = 3) {
 
		$e = explode(" ", str_replace(array(",", "."), " ", strtolower($txt)));
		$a = array_count_values($e);
		arsort($a); array_shift($a);
		$p = array_keys($a);
		for ($l = 0; $l < count($p); $l++) {
			if (strlen($p[$l]) >= $long ) {
				$f[] = $p[$l];
			}
		}
		for ($i = 0; $i < $lim; $i++) {
			$kW[] = $f[$i];
		}
		return $kW;
	}
 
 
	$txt = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.";
	$txt2 = "Silence! Stupid monkey. I kill you. You think you\'r better than my chicken! NO! Stupid monkey. My chicken is better than you! I kill you! Stupid monkey... my chicken is the best!";
	$txt3 = "Note that in a multidimensional array, each element may be identified by a _sequence_ of keys, i.e. the keys that lead towards that element. Thus \"preserving keys\" may have different interpretations. Ivan's function for example creates a two-dimensional array preserving the last two keys. Other functions below create a one-dimensional array preserving the last key. For completeness, I will add a function that merges the key sequence by a given separator and a function that preserves the last n keys, where n is arbitrary.";
	kWords($txt, 5, 4);
 
 
?>

Array
(
    [0] => stupid
    [1] => monkey
    [2] => chicken
    [3] => you!
    [4] => than
)