电子邮件附件在PHP中不起作用

Question

I was trying to add a feature on my website which allows users to add attachments while sending emails. I tried this with PHP, but the code is not working. It is neither uploading the attachment, nor inserting the URL of the attachment in my database, nor echoing the confirmation message.

All the other form code is processed successfully, except the attachment. Please suggest me what changes should be made to the code:

PHP:

if (isset($_POST['attachment']))
{
    if ($_FILES['file']['size'] > 52428800)
    {
        $attachment_results =  "Sorry, your attachment could not be processed as it is exceeding the limit of 50 MB.";
    }
    else
    {
        if ($_FILES["file"]["error"] > 0)
        {
           $attachment_results =  "Sorry, your attachment could not be processed due to some error. Return Code: " . $_FILES["file"]["error"] . "<br>";
        }
        else
        {
            $attachment_results = "Your attachment was also processed successfully.<br>
            File name: " . $_FILES['file']['name'] . "<br>Attachment Size: " . $_FILES['file']['size'];
            $destination = "attachments/" . $_FILES['file']['name'];
            move_uploaded_file($_FILES['file']['name'], $destination);
            $url = "https://$domain_name/$destination";
        }
    }
    echo $attachment_results;
}

Later in the script, $url is to be inserted in the MySQL database, but that doesn't work either. Just a blank variable is inserted in the database.

Here's the HTML code:

<form enctype="multipart/form-data" method="post" action="">
<input type="file" name="attachment" style="color: #000000;"><label>(Maximum 50 MB)    </label>
<!-- Other Form Code -->
</form>

Answer 1

<?php 
if (isset($_POST['submit']))
{

print_r($_FILES);
    if ($_FILES['attachment']['size'] > 52428800)
    {
        $attachment_results =  "Sorry, your attachment could not be processed as it is exceeding the limit of 50 MB.";
    }
    else
    {
        if ($_FILES["attachment"]["error"] > 0)
        {
           $attachment_results =  "Sorry, your attachment could not be processed due to some error. Return Code: " . $_FILES["file"]["error"] . "<br>";
        }
        else
        {
            $attachment_results = "Your attachment was also processed successfully.<br>
            File name: " . $_FILES['attachment']['name'] . "<br>Attachment Size: " . $_FILES['file']['size'];
            $destination = "attachments/" . $_FILES['attachment']['name'];
            move_uploaded_file($_FILES['attachment']['tmp_name'], $destination);
            $url = "https://$domain_name/$destination";
        }
    }
    echo $attachment_results;
}
?>


<form enctype="multipart/form-data" method="post" action="">
<input type="file" name="attachment" style="color: #000000;"><label>(Maximum 50 MB)    </label>
<input type="submit" name="submit">
</form>