php关键词替换的类(避免重复替换，保留与还原原始链接)

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Freigeben： 2016-07-25 08:57:31

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/*
* 关键词匹配类
* @author ylx
* @packet mipang
* 使用实例
* $str = "绿壳蛋鸡撒范德萨下一年，下一年1的洒落开房间卢卡斯地方军";
* $key = new KeyReplace($str,array("xxxx"=>"sadf","下一年1"=>'http://baidu.com',"下一年"=>'google.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) }
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 = $a = array();
if(preg_match_all("#]+>[^]*>#su",$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",''.$key.'',$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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