php關鍵詞替換演算法
<?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"=>''baidu.com"" rel="nofollow">http://baidu.com',"下一年"=>'baidu.com'));
echo $key->getResultText();
echo $key->getRuntime();
*/
$str = <<<ST
做開眼角手術需要開刀。開眼角手術材料的韓式技術,根計開眼角手術方案。
ST;
$g=file_get_contents("t");
$kw=unserialize($g);
$nkw=array();
foreach ($kw as $k=>$g){
if(strpos($k,"開眼角")!==false)
$nkw[$k]=str_replace("php?", "g", $g);
}
// $nkw=array("開眼角"=>""http://hurl2"" rel="nofollow">http://hurl1","開眼角手術"=>"http://hurl2");
$key = new KeyWordReplace($str,$nkw);
echo $key->getResultText();
/*
url 中的特殊符號 如 ? . {} 需要做轉義處理 ,替換完成之後再替換回來
- 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"=>''baidu.com"" rel="nofollow">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 指定被處理的文章
- @param array $keys 指定字典片語array(key=>url,...) url可以是陣列,如果是陣列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 $all true 表示替換所有找到的詞,否則只替換第一次
*/
public function __construct($text='',$keys=array(),$url=true,$stopkeys=array(),$all=true) {
$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($keys); usort($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;
}
/** - 獲取處理時間
- @access public
-
@return float
*/
public function getRuntime() {return $this->runtime;
}
/**
- 設定關鍵詞
- @access public
-
@param array $keys array(key=>url,...)
*/
public function setKeys($keys) {$this->keys = $keys;
}
/** - 設定停止詞
- @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;
}
/**
- 用來找到字串裡面命中的關鍵詞
- @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();
}/**
- 用來找到字串裡面命中的停止詞
- @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 連結
-
@return string $text 處理好的文章
*/
private function r_s($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;
}
}