php关键词替换算法

发布时间：2020-07-02 15:48:11 作者：bx123
来源：网络阅读：501

<?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();
*/

$str = <<<ST
　　做开眼角手术需要开刀。开眼角手术材料的韩式技术，根计开眼角手术方案。
ST;

$g=file_get_contents("t");
$kw=unserialize($g);

$nkw=array();

foreach ($kw as $k=>$g){

if(strpos($k,"开眼角")!==false)
    $nkw[$k]=str_replace("php?", "g", $g);

}

// $nkw=array("开眼角"=>"http://hurl1","开眼角手术"=>"http://hurl2");

$key = new KeyWordReplace($str,$nkw);
echo $key->getResultText();

url 中的特殊符号如 ? . {} 需要做转义处理，替换完成之后再替换回来

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 $key->getRuntime();
*/
function cmp2($a, $b){

$len_a=mb_strlen($a,"utf-8");
$len_b=mb_strlen($b,"utf-8");

if ($len_a == $len_b) return 0;
return ($len_a< $len_b) ? 1 : -1;
}

class KeyWordReplace
{
public $keys = array();
public $text = "";
private $runtime = 0;
public $url = true;
public $stopkeys = array();
public $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=true) {
$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);

usort($keys_tmp,"cmp2");

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 = $text;

$stop_keys = $this->hits_stop_keys();

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

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

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

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

        if(!empty($a)){

            foreach($a as $n=>$at){

                $tmp_text = str_replace("[_a".$n."_]",$at,$tmp_text);

            }

        }
        if(!empty($tags)){

            foreach($tags as $n=>$at){

                $tmp_text = str_replace("[_tag".$n."_]",$at,$tmp_text);

            }

        }
        if(!empty($stopkeys)){

            foreach($stopkeys as $n=>$at){

                $tmp_text = str_replace("[_s".$n."_]",$at,$tmp_text);

            }
        }
        return $tmp_text;

}
}

php关键词替换算法

相关阅读