代码：【复制】 
function HilightKeyword($str,$strkey) {
    $ks = explode(" ",$strkey);
	if(strpos($strkey,",")){
		$ks = explode(",",$strkey);
	}
    foreach($ks as $k){
		$k = trim($k);
		if($k=="") continue;
		if(ord($k[0])>0x80 && strlen($k)<3) continue;
		preg_match_all('/'.$k.'/i',$str,$m);		

		for($i=0;$i<count($m[0]);$i++) {
			$str = eregi_replace($m[0][$i],"<span style='color:#FF0000;background:#FFFF99'>".$m[0][$i]."</span>",$str);
		}
	}
    return $str;
}