PHP 替換文章關鍵字，鏈接 只替換一次

<?php
/*

• 關鍵詞匹配類
• $str = "是是是是是范德薩下一年，下一年誰誰誰水水水水的灑落開是是是是軍";
• $key = new KeyReplace($str,array("下一年1"=>'http://baidu.com',"下一年"=>'baidu.com'));
• echo $key->getResultText();

• echo $key->getRuntime();
  */
  class KeyReplace
  {
  private $keys = array();
  private $text = "";
  private $runtime = 0;
  private $url = true;
  private $stopkeys = array();
  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,...) 這里面的詞將不會被處理
  • @param boolean $url true 表示替換成鏈接否則只替換
  • @param boolean $all true 表示替換所有找到的詞，否則只替換第一次
    */
    public function __construct($text='',$keys=array(),$url=true,$stopkeys=array(),$all=false) {
    $this->keys = $keys;
    $this->text = $text;
    $this->url = $url;
    $this->stopkeys = $stopkeys;
    $this->all = $all;
    }

  /**

  • 獲取處理好的文章
  • @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) < mb_strlen($b)) ? 1 : -1;
  }

  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;
  }
  /**

  • 獲取處理時間
  • @access public

  • @return float
    */
    public function getRuntime() {

    return $this->runtime;

  }

  /**

  • 設置關鍵詞
  • @access public

  • @param array $keys array(key=>url,...)
    */
    public function setKeys($keys) {

    $this->keys = $keys;

  }
  /**

  • 設置停止詞
  • @access public

  • @param array $keys array(key,...)
    */
    public function setStopKeys($keys) {

    $this->stopkeys = $keys;

  }
  /**

  • 設置文章
  • @access public

  • @param string $text
    */
    public function setText($text) {

    $this->text = $text;

  }

  /**

  • 用來找到字符串里面命中的關鍵詞
  • @access public
  • @return array $keys 返回匹配到的詞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();
    }

  /**

  • 用來找到字符串里面命中的停止詞
  • @access public
  • @return array $keys 返回匹配到的詞array(key,...)
    */
    public function hits_stop_keys(){
    $ar = $this->stopkeys;
    $ar = $ar?$ar:array();
    $result=array();
    $str = $this->text;
    foreach($ar as $k){
    $k = trim($k);
    if(!$k)
    continue;
    if(strpos($str,$k)!==false && in_array($k,$this->stopkeys)){
    $result[] = $k;
    }
    }
    return $result?$result:array();
    }

  /**

  • 處理替換過程
  • @access private
  • @param string $text 被替換者
  • @param string $key 關鍵詞
  • @param string $url 鏈接

  • @return string $text 處理好的文章
    */
    private function r_s($text,$key,$url){

    $tmp = $text;

    $stop_keys = $this->hits_stop_keys();

    $stopkeys = $tags = $a = array();
    if(preg_match_all("#<a[^>]+>[^<]</a[^>]>#su",$tmp,$m)){
    $a=$m[0];

    foreach($m[0] as $k=>$z){
        $z = preg_replace("#\##s","\#",$z);
    
        $tmp = preg_replace('#'.$z.'#s',"[_a".$k."_]",$tmp,1);
    }

    };

    if(preg_match_all("#<[^>]+>#s",$tmp,$m)){
    $tags = $m[0];
    foreach($m[0] as $k=>$z){
    $z = preg_replace("###s","#",$z);
    $tmp = preg_replace('#'.$z.'#s',"[tag".$k."]",$tmp,1);
    }
    }
    if(!empty($stop_keys)){
    if(preg_match_all("#".implode("|",$stop_keys)."#s",$tmp,$m)){
    $stopkeys = $m[0];
    foreach($m[0] as $k=>$z){
    $z = preg_replace("###s","#",$z);
    $tmp = preg_replace('#'.$z.'#s',"[s".$k."]",$tmp,1);
    }
    }
    }
    $key1 = preg_replace("#([#()[]*])#s","\\$1",$key);

    if($this->url)
    $tmp = preg_replace("#(?![_s|[a|[|[_t|[_ta|[tag)".$key1."(?!ag\d+]|g\d+]|\d+]|s\d+]|])#us",'<a href="'.$url.'">'.$key.'</a>',$tmp,$this->all?-1:1);
    else
    $tmp = preg_replace("#(?![_s|[a|[|[_t|[_ta|[tag)".$key1."(?!ag\d+]|g\d+]|\d+]|s\d+]|])#us",$url,$tmp,$this->all?-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);
    
    }

    }
    return $tmp;
    }
    }