@H_502_0@PHP中，从数据库读取数据，并以json格式返回数据。具体方法如下：

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第一步，定义相关变量

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<pre class="brush:PHP;">
$servername = "localhost";
$username = "root";
$password = "root";
$MysqLname = "datatest";
$json = '';
$data = array();
class User
{
public $id;
public $fname;
public $lname;
public $email;
public $password;
}