PHP gets the value in the input box and compares it with the database to display it.

Front-end:

php background receiving and querying:

public function MallList(){ //写方法
$goods=M('shop_goods_info'); //实例化数据库对应的表
$codes=I('param.bianhao'); //获取前台文本框数据
if(isset($codes) && $codes != ''){
$where['code']=$codes;
$this->assign('codes',$codes); //显示
}
}
$info=$classify->where(array('code'=>$code))->find(); //查询语法

2. Or:

has $_GET or $_POST

文本框:

If it is GET, change it to GET