php關鍵字替換的類別(避免重複替換，保留與還原原始連結)

 /*
 * 關鍵字匹配類別
 * @author ylx  * @author ylx
 * @packet mipang
 * 使用實例
 * $str = "綠殼蛋雞撒范德薩下一年，下一年1的灑落開房間盧卡斯地方軍";
 * $key = new KeyReplace($str,array("xxxx"=>"sadf","下一年1"=>'http://baidu.com',"下一年"=>'google. com'));
 * echo $key->getResultText();
 * echo $key->getRuntime();
 */
class KeyReplace
{
 private $ keys = array();
 private $text = "";
 private $runtime = 0;
 private $url = true;
 private $stopkeys = array();
 private $private $ all = false;
 /**
 * @access public
 * @param string $text 指定被處理的文章
 * @param array $keys 指定字典詞組array(key=>url,...) url可以是數組，如果是數組將隨機替換其中的一個
 * @param array $stopkeys 指定停止詞array(key,...) 這裡面的詞將不會被處理
 * @param boolean $url true 表示替換成連結否則只替換
 * @param boolean $all tr​​ue 表示替換所有找到的詞，否則只替換第一次
*/
 public function __construct($text='',$keys=array(),$url=true,$stopkeys=array(),$all= false) {
 $this->keys = $keys;
 $this->text = $text;
 $this->url = $url;
 $this->stopkeys = $stopkeys ;
 $this->all = $all;
 }
 /**
 * 取得處理好的文章
 * @access public
 * @return string text
*/
 public function getResultText() {
 $start = microtime(true);
 $keys = $this->hits_keys();
 $keys_tmp = array_keys($keys);
 function cmp ($a, $b){
 if (mb_strlen($a) == mb_strlen($b)) {
 return 0;
 }
 return (mb_strlen($a)  }
 usort($keys_tmp,"cmp");
 foreach($keys_tmp as $ key){
 if(is_array($keys[$key])){
 $url = $keys[$key][rand(0,count($keys[$key ])-1)];
 }else
 $url = $keys[$key];
 $this->text = $this->r_s($this- >text,$key,$url);
 }
 $this->runtime = microtime(true)-$start;
 return $ this->text;
 }
 /**
 * 取得處理時間
 * @access public
 * @return float
*/
 public function getRuntime() {

 return $this->runtime;
 }
 /**
 * 設定關鍵字
 * @access public
 * @param array $keys array(key=>url,...)
*/
 public function setKeys($keys) {
 $this-> keys = $keys;
 }
 /**
 * 設定停止字
 * @access public
 * @param array $keys array(key,...)
*/
 public function setStopKeys($keys) {
 $this ->stopkeys = $keys;
 }
 /**
 * 設定文章
 * @access public
 * @param string $text
*/
 public function setText($text) {
 $this->text = $text;
 }
 /**
 * 用來找出字串裡面命中的關鍵字
 * @access public
 * @return array $keys 回傳符合的字array(key=>url,...)
*/
 public function hits_keys(){
 $ar = $this->keys;
 $ar = $ar?$ar:array();
 $result=array();
 $str = $this->text;
 foreach($ar as $k=>$url){
 $k = trim($k);
 if(!$k)
 continue;
 if(strpos($str,$ k)!==false && !in_array($k,$this->stopkeys)){
 $result[$k] = $url;
 }
 }
 return $result?$ result:array(); }
 /**
 * 用來找出字串裡面命中的停止詞
 * @access public
 * @return array $keys 回傳符合的字array(key,...)
*/
 public function hit_stop_keys(){
 $ar = $this->stopkeys;
 $ar = $ar?$ar :array();
 $ result=array();
 $str = $this->text;
 foreach($ar as $k){
 $k = trim($k) ;
 if(!$ k)
 繼續;
 if(strpos($str,$k)!==false && in_array($k,$this->stopkeys)){
 $結果[] = $k;
 }
 }
 回傳 $result?$result:array();
 }
 /**
 * 處理替換過程
 * @access private
 * @param string $text 被替換者
 * @param string $key 關鍵字
 * @param string $url 連結
 * @return string $text 處理好的文章
*/
 蕨函數 r_s ($text,$key,$url){
 $tmp = $text;
 $stop_keys = $this->hits_stop_keys(); p>
 $stopkeys = $tags = $a = array();
 if(preg_match_all("#]+>[^] *> ;#su",$tmp,$m)){
 $a=$m[0];
 $tmp = preg_replace("#(?![_s|[_a|[_|[_t|[_ta|[_tag)]".$key1."(?!agd +_]|gd+_]|d+_] | sd+_]|_])#us",''.$key.'',$tmp,$this->all?-1 : 1);
 else
 $tmp = preg_replace("#(?![_s|[_a|[_|[_t|] [_ta|[_tag)]".$key1."(?! agd+ _]|gd+_]|d+_]|sd+_]|_])#us",$url,$tmp,$this ->全部？-1:1);
  if(!empty($a)){
 foreach($a as $n=>$at){
 $tmp = str_replace ("[_a".$n."_]",$at,$tmp);
 }
 }
 if(! empty ($tags)){
 foreach($tags as $n=>$at){
 $tmp = str_replace("[_tag". $ n."_]",$at,$tmp);
 }
 }
 if(!empty($stopkeys)){
 foreach($stopkeys as $n=>$at){
 $tmp = str_replace("[_s".$n."_]" , $at,$tmp);
 }
 }
 回傳$tmp;
 }
}