php关键词替换算法
/*
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;
$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("#}
}