How to verify login in php through SMTP email

The example in this article describes the method of php verifying login through SMTP email. Share it with everyone for your reference, the details are as follows:

In order to unify accounts, the intranet system uses the method of logging in with an email account, so the following procedures are available

/**
* 通过邮件 验证登陆
* 这里要明白的是用户名是 带域名的：aaa@163.com
*/
function valideEmailLogin($user, $pass, $smtp_server= 'smtp.163.com', $port=25)
{
$handle = fsockopen($smtp_server, $port);
if(!$handle)
return false;
$mes = fgets($handle);
//echo $mes;
if(!$mes){
fclose($handle);
return false;
}
$status = explode(" ",$mes);
if($status[0] != 220) { //链接服务器失败
fclose($handle);
return false;
}
fwrite($handle, 'HELO mystore'."\r\n"); //表明身份,这里的mystore是随便写的
$mes = fgets($handle);
//echo $mes;
if(!$mes){
fclose($handle);
return false;
}
$status = explode(" ",$mes);
if($status[0] != 250) { //服务器HELO失败
fclose($handle);
return false;
}
fwrite($handle, 'AUTH LOGIN'."\r\n");
$mes = fgets($handle);
//echo $mes;
if(!$mes){
fclose($handle);
return false;
}
$status = explode(" ",$mes);
if($status[0] != 334) { //请求验证登陆失败
fclose($handle);
return false;
}
fwrite($handle,base64_encode($user)."\r\n");
$mes = fgets($handle);
//echo $mes;
if(!$mes){
fclose($handle);
return false;
}
$status = explode(" ",$mes);
if($status[0] != 334) { //验证用户名失败
fclose($handle);
return false;
}
fputs($handle,base64_encode($pass)."\r\n"); 
$mes = fgets($handle);
//echo $mes;
if(!$mes){
fclose($handle);
return false;
}
$status = explode(" ",$mes);
fclose($handle);
if($status[0] != 235) { //验证密码失败
return false;
}else{
return true;
}
}

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The above introduces the method of PHP verification login through SMTP email, including SMTP and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.