PHP mail（）函数发送重复（空）电子邮件

Question

I've tried searching the forums, I have found that some other people have been having the same issue as me, but haven't found a solution that works yet.

I am creating a portal where the customer enters their information in the form and uploads an image, which is then sent as an attachment to the email.

I am finding that when I use the PHP mail() function, it is sending duplicate emails, one with the POST data, and one without. I am only calling the function once, and as far as I can tell I am only loading the page once.

Here is my code:

//recipient address (made up but you get the idea)
$to = '[e-mail]';

//subject of email
$subject = 'Phone Order from Online Portal'; 

//create body of message
$message =  "An order has been placed using the Portal.
";
$message .= "The order details are as follows:
";
$message .= "
";
$message .= "First Name: ".$_POST["firstname"]."
";
$message .= "Last Name: ".$_POST["lastname"]."
";
$message .= "Phone Number: ".$_POST["phonenumber"]."
";
$message .= "Email Address: ".$_POST["emailaddress"]."
";
$message .= "
";
$message .= "Phone: " . $_POST["phone"] . "
";
$message .= "Color: " . $_POST["color"] . "
";
$message .= "Voice Plan: " . $_POST["voiceplan"] . "
";
$message .= "Data Plan: " . $_POST["dataplan"] . "
";

//get file details from previous form
$file_tmp_name    = $_FILES['uploaded_file']['tmp_name'];
$file_name        = $_FILES['uploaded_file']['name'];
$file_size        = $_FILES['uploaded_file']['size'];
$file_type        = $_FILES['uploaded_file']['type'];

//read from the uploaded file & base64_encode content for the mail
$handle = fopen($file_tmp_name, "r");
$content = fread($handle, $file_size);
fclose($handle);
$encoded_content = chunk_split(base64_encode($content));

//random number for headers
$boundary = md5("sanwebe"); 

//create the headers
$headers = "MIME-Version: 1.0
"; 
$headers .= "From: [e-mail]
"; 
$headers .= "Reply-To: [e-mail]
";
$headers .= "Content-Type: multipart/mixed; boundary = $boundary

";

//plain text info
$body = "--$boundary
";
$body .= "Content-Type: text/plain; charset=ISO-8859-1
";
$body .= "Content-Transfer-Encoding: base64

"; 
$body .= chunk_split(base64_encode($message)); 

//attachment info
$body .= "--$boundary
";
$body .="Content-Type: $file_type; name='$file_name'
";
$body .="Content-Disposition: attachment; filename='$file_name'
";
$body .="Content-Transfer-Encoding: base64
";
$body .="X-Attachment-Id: ".rand(1000,99999)."

"; 
$body .= $encoded_content;  

//send the email
mail($to, $subject, $body, $headers);

Everything works beautifully except for the fact that it sends one email complete with the information and attachment, another with no information from POST and a 0kb attachment. Any ideas? Is it a problem with the server possibly?

Answer 1

Wrap all of the mail code some sort of validation logic. Overall you want to:

1. Ensure that the request being made is in fact a POST request
2. Ensure that the required POST parameters are included in the request.

You can achieve that with code similar to the following:

function validRequest() {
    return (
        // make sure that the request type is POST
        $_SERVER['REQUEST_METHOD'] === 'POST'
        // make sure the required POST variables were included
        && isset($_POST['firstname'])
        && isset($_POST['lastname'])
        && isset($_POST['phonenumber'])
        && isset($_POST['emailaddress'])
        && isset($_POST['phone'])
        && isset($_POST['color'])
        && isset($_POST['voiceplan'])
        && isset($_POST['dataplan'])
        // make sure that there is a file
        && $_FILES['uploaded_file']
    );
}

if (validRequest()) {
    // your email code
} else {
    // there was some sort of error
}

I would bet if you looked at your server log you would be getting some errors saying that the array key does not exist.