PHP 替换文章关键字，链接只替换一次

发布时间：2020-08-03 22:30:10 来源：网络阅读：459 作者：bx123 栏目：开发技术

<?php
/*

关键词匹配类
$str = "是是是是是范德萨下一年，下一年谁谁谁水水水水的洒落开是是是是军";
$key = new KeyReplace($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 指定被处理的文章
- @param array $keys 指定字典词组array(key=>url,...) url可以是数组，如果是数组将随机替换其中的一个
- @param array $stopkeys 指定停止词array(key,...) 这里面的词将不会被处理
- @param boolean $url true 表示替换成链接否则只替换
- @param boolean $all true 表示替换所有找到的词，否则只替换第一次
  */
  public function __construct($text='',$keys=array(),$url=true,$stopkeys=array(),$all=false) {
  $this->keys = $keys;
  $this->text = $text;
  $this->url = $url;
  $this->stopkeys = $stopkeys;
  $this->all = $all;
  }
/**
- 获取处理好的文章
- @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;
}
/**
- 获取处理时间
- @access public
- @return float
  */
  public function getRuntime() {
  
  return $this->runtime;
}

/**
- 设置关键词
- @access public
- @param array $keys array(key=>url,...)
  */
  public function setKeys($keys) {
  
  $this->keys = $keys;
}
/**
- 设置停止词
- @access public
- @param array $keys array(key,...)
  */
  public function setStopKeys($keys) {
  
  $this->stopkeys = $keys;
}
/**
- 设置文章
- @access public
- @param string $text
  */
  public function setText($text) {
  
  $this->text = $text;
}

/**
- 用来找到字符串里面命中的关键词
- @access public
- @return array $keys 返回匹配到的词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();
  }
/**
- 用来找到字符串里面命中的停止词
- @access public
- @return array $keys 返回匹配到的词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();
  }
/**
- 处理替换过程
- @access private
- @param string $text 被替换者
- @param string $key 关键词
- @param string $url 链接
- @return string $text 处理好的文章
  */
  private function r_s($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;
  }
  }

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PHP 替换文章关键字，链接 只替换一次

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