PHP determines whether the user has logged in instance analysis

This article mainly introduces the relevant information on PHP to determine whether the user has logged in. It is very good and has reference value. Friends in need can refer to it

1.

2.

<if condition="$GLOBALS[&#39;userinfo&#39;][&#39;user_id&#39;] gt 0">
<span class="help_wz"><a href="{$Think.config.VIP_URL}/Member/user_pwd/" style="color:#404958;">找回登录密码</a></span>
<else/>
<span class="help_wz"><a href="/Login/FindPwd" style="color:#404958;">找回登录密码</a></span>
</if>

3. Set global variables in the background and query user information

public function UserInfo($user_id){
//查询系统信息
$system=array(
'CmdId'=>'System',
'Token'=>'wap',
'PostDetails'=>json_encode(array(
)));
//通过curl的post方式发送接口请求
$curl=new CurlController();
$strs=$curl->SendCurl($system);
$GLOBALS['system']=$strs['AcctDetails'];
if(empty($user_id)){
return false;
}
setcookie("login_uid", $user_id, time() + 3600, "/", C('cookie_url'));
setcookie("rdun", $this->authcode($user_id . "," . time(), "ENCODE"), time() + 3600,"/",C('cookie_url'));;
$data=array(
'CmdId'=>'Inpidual',
'Token'=>session('token'),
'PostDetails'=>json_encode(array(
'user_id'=>$user_id,
)));
//通过curl的post方式发送接口请求
$curl=new CurlController();
$str=$curl->SendCurl($data);
$GLOBALS['userinfo']=$str['AcctDetails'];
$newtoken=unserialize($str['AcctDetails']['token']);
$oldtoken=unserialize(session('token'));
if(!empty(session('token')) && !empty($str['AcctDetails']['token'])){
//用户不对
if($newtoken['user_id'] !== $newtoken['user_id']){
session('token',null);
session('user_id',null);
header('Location:/Login/Login');
return false;
}
//token不对
if($newtoken['time'] !== $oldtoken['time']){
session('token',null);
session('user_id',null);
header('Location:/Login/Login');
return false;
}
//超时的不能在这做，原因是存入session的值不变，如果用户一直操作的话，而且只登陆一次，那么就会出现问题
}
return true;
}

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