分享一个好用PHP字符串替换类库（指定替换数组并可设置跳过指定白名单字符串） - 无限星辰工作室-客户无限互联网动力之源

/*
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 = "是是是是是必须的下一年1，下一年谁谁谁水水水水的洒落开是是是是";
$key = new KeyReplace($str,array("下一年1"=>'http://xmspace.net',"下一年"=>'xmspace.net'));
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;
}
}

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