tp3.2的模糊搜索

  //优惠券搜索
    public function coupon_search(){
        $key_word = I('post.name');
        $key_strleng = mb_strlen($key_word,'utf8');
        if($key_strleng ==0){
            $this->error('优惠券搜索关键词不能为空！！！',U('/addon/WeiuidStore/web/goodscouponIndex'),3);
        }
        $key_word = mb_substr($key_word,0,8,'utf-8');
        $where['coupon_name'] = array('LIKE',"%".$key_word."%");
        // 优惠卷数据
        $coupondata = D('goodscoupon')->where($where)->select();
        $this->assign([
            'coupondata'=>$coupondata,
            'name'=>$key_word
        ]);
        $this->display("Web/goodscouponindex");
    }

                 <form class="pull-right position" action="{:U('/addon/WeiuidStore/web/coupon_search')}" method="post">
                    <div class="input-append" style="border: 1px solid #aaa;border-radius: 5px;padding-left:10px;">
                        <input type="text" name="name" value="{$name}" class="sousuo">
                        <button class="btn btn-primary"><i class="icon-search"></i></button>
                    </div>
                    <div class="nr">
                            请输入您要查询的优惠卷名称
                    </div>
                </form>