<?php
function seokeywords($contents,$symbol=5,$words=70){
    $contents = @preg_replace(array("'<[\/\!]*?[^<>]*?>'si","'([\r\n])[\s]+'si","'&[a-z0-9]{1,6};'si","'( +)'si"),
    array("","\\1 "," "," "),strip_tags($contents));
    $rearray = array("~","!","@","#","$","%","^","&","*","(",")","_","+",
	                 "`",'"',"№",";",":","?","-","=","|","\"","\\","/",
	                 "[","]","{","}","'",",",".","<",">","\r\n","\n","\t","«","»");

    $adjectivearray = array("ые","ое","ие","ий","ая","ый","ой","ми","ых","ее","ую","их","ым",
	                        "как","для","что","или","это","этих",
	                        "всех","вас","они","оно","еще","когда",
	                        "где","эта","лишь","уже","вам","нет",
	                        "если","надо","все","так","его","чем",
	                        "при","даже","мне","есть","только","очень",
	                        "сейчас","точно","обычно"
                            );


    $contents = @str_replace($rearray," ",$contents);
    $keywordcache = @explode(" ",$contents);
    $rearray = array();

    foreach($keywordcache as $word){
	if(strlen($word)>=$symbol && !is_numeric($word)){
	    $adjective = substr($word,-2);
	    if(!in_array($adjective,$adjectivearray) && !in_array($word,$adjectivearray)){
		$rearray[$word] = (array_key_exists($word,$rearray)) ? ($rearray[$word] + 1) : 1;
	    }
	}
    }

    @arsort($rearray);
    $keywordcache = @array_slice($rearray,0,$words);
    $keywords = "";

    foreach($keywordcache as $word=>$count){
	$keywords.= ",".$word;
    }

    return substr($keywords,1);
}


?>