Php article keyword replacement class

<?php
/*
 *  Keyword matching class 
 * $str = " It's van der Sar next year , The next year is the army ";
 * $key = new KeyReplace($str,array(" Next year 1"=>'http://baidu.com'," Next year "=>'baidu.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  Specify the article to be processed 
     * @param array $keys  Specify dictionary phrases array(key=>url,...) url It could be an array , If it is an array, one of them will be replaced randomly 
     * @param array $stopkeys  Specify stop word array(key,...)  The words in this will not be processed 
     * @param boolean $url true  Means to replace with a link, otherwise only replace 
     * @param boolean $all true  Replace all found words , Otherwise, only replace the first time 
     */
    public function __construct($text='',$keys=array(),$url=true,$stopkeys=array(),$all=false) {
        $this->keys = $keys;
        $this->text = $text;
        $this->url = $url;
        $this->stopkeys = $stopkeys;
        $this->all = $all;
    }

    /**
     *  Get processed articles 
     * @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) < mb_strlen($b)) ? 1 : -1;
        }
        usort($keys_tmp,"App\Traits\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;
    }
    /**
     *  Get processing time 
     * @access public
     * @return float
     */
    public function getRuntime() {

        return $this->runtime;

    }

    /**
     *  Set keywords 
     * @access public
     * @param array $keys array(key=>url,...)
     */
    public function setKeys($keys) {

        $this->keys = $keys;

    }
    /**
     *  Set stop word 
     * @access public
     * @param array $keys array(key,...)
     */
    public function setStopKeys($keys) {

        $this->stopkeys = $keys;

    }
    /**
     *  Set up articles 
     * @access public
     * @param string $text
     */
    public function setText($text) {

        $this->text = $text;

    }

    /**
     *  Used to find the keyword hit in the string 
     * @access public
     * @return array $keys  Return the matched word 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();
    }

    /**
     *  Used to find the stop word hit in the string 
     * @access public
     * @return array $keys  Return the matched word 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();
    }

    /**
     *  Handle the replacement process 
     * @access private
     * @param string $text  Replaced 
     * @param string $key  key word 
     * @param string $url  link 
     * @return string $text  Processed articles 
     */
    private function r_s($text,$key,$url){

        $tmp = $text;

        $stop_keys = $this->hits_stop_keys();

        $stopkeys = $tags = $a = array();
        if(preg_match_all("#<a[^>]+>[^<]*</a[^>]*>#su",$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",'<a href="'.$url.'">'.$key.'</a>',$tmp,$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;
    }
}

Keyword replacement method ( notes ： If the replacement array is inconsistent with the length of the article keyword, an error will be reported )

$res = ' The lessor （ Hereinafter referred to as Party A ）：   xxx Technology Co., Ltd            
 Contacts ：     xxx                      
 contact number ：   xxx                                
 Address ： xxx    
 Lessor's address  xxx';

$array = array('home', 'garage','1',3);

$count = substr_count($res, 'xxx');

if ($count > 0) {

    $arr = explode('xxx', $res);

    $res = '';

    for ($i = 0; $i < $count; $i++) {

        $res .= $arr[$i] . '"' . $array[$i] . '"';

        $i + 1 == $count && ($res .= $arr[$i + 1]);

    }

}


echo $res;