关键词多空格处理

public function keyWord($condition) {

        //如果搜索的是上次的计算的结果，就直接返回
        $momon = Model()->table('goods')->limit(false)->field('goods_name')->select();
        if(is_array($condition) && !empty($condition['goods_name|goods_jingle']) && !empty($momon)) {
            $key = $condition['goods_name|goods_jingle'][1];
            $key = substr($key,1);
            $key = substr($key,0,-1);//用户输入关键字
            $key = $this->removePlace($key);
            $str = $this->tolower($key);

            //将用户关键词去空格和小写后，与数据库的商名比对，找出一条相似的字符串
            foreach($momon as $k=>$v) {
                $data_lower = $this->tolower($v['goods_name']);//将要比对的数据库商品名小写，去对比，小写的用户关键字
                $v = $this->removePlace($data_lower);//将数据库的商品名清除空格
                $result = strpos($v, $str);
                if($result !== false) {
                    $father_str_lower = $data_lower;
                    $father_str       = $v;
                    $chil_str         = $str;
                    break;
                }
            }
            if(!empty($chil_str)) {
                $check_arr = explode(' ',$father_str_lower);
                foreach($check_arr as $v) {
                    $chil_str = preg_replace("/".$v."/", " ".$v." ", $chil_str);
                    $chil_str = preg_replace('/s{2,}/',' ',$chil_str);
                    $chil_str = trim($chil_str);
                }
                $_SESSION['chil_str'] = $chil_str;
                $condition['goods_name|goods_jingle'][1] = "%".$chil_str."%";
            }
        }
        return $condition;
    }
    /*
     *中英字符串转小写
     * retun str
     * */
     public function tolower($a) {
        $b = str_split($a, 1);  
           $r = '';  
           foreach($b as $v){  
               $v = ord($v);  
               if($v >= 65 && $v<= 90){  
                   $v += 32;  
               }  
               $r .= chr($v);  
           }  
           return $r;  
     }
    /*
     * 去除空格
     * return str
     */
    public function removePlace($str) {
        $str = preg_replace("/s/is", "",$str);
        return $str;
    }
    /*
     *数据库所有商品名称 
     * return arr
     */
    public function allLowner_goodsName() {
        $data = Model()->table('goods')->limit(false)->select();

        return $data;
    }