使用IP以CSV格式存储数据存储：未定义错误

Question

我试图从访问者处获取电子邮件，国家和IP地址并将其存储到CSV中，并且还会向该站点所有者发送电子邮件。

我没有太多熟悉的，但我得到了大多数事情的作品，但没能摆脱掉未定义错误$cvsData .= "\"$email\",\"$ip\"".PHP_EOL;线...

Error Message: Notice: Undefined index: ip_address in

这里是我的代码

<?php 

// this is to store form into csv file 
    if(isset($_POST["submit"])) 
    { 
     $email = $_POST["email"]; 
     $ip = $_SERVER['REMOTE_ADDR']; 


     if(empty($email)) 
     { 
      echo "ERROR MESSAGE"; 
      die; 
     } 
     $cvsData .= "\"$email\",\"$ip\"".PHP_EOL; 
     $fp = fopen("emails.csv", "a"); 

     if($fp) 
     { 
      fwrite($fp,$cvsData); // Write information to the file 
      fclose($fp); // Close the file 
      echo "<h3>Thank you! we will inform you.....</h3>"; 
     }  

    } 

// this is to send email to site owner 

    // Contact subject 
    $email ="$email"; 
    // Enter your email address 
    $to ='myemail@site.com'; 

    $subject ='site Email Submited'; 

    $send_email=mail($to,$email,$subject); 

    // Check, if message sent to your email 
    // display message "We've recived your information" 
    if($send_email){ 
     echo "Email address is sent to the department."; 
    } else { 
     echo "ERROR"; 
    } 

?> 

表只有一个字段名称=“电子邮件”，并提交按钮

Answer 1

错误不在您的代码（你粘贴），因为没有提到ip_address。