如何修改SendGrid代码实现表单附件邮件发送？

Let's fix your code to handle file uploads from your form and send them as attachments via SendGrid. First, make sure your HTML form has the enctype="multipart/form-data" attribute—this is mandatory for file uploads to work properly.

Step-by-Step Code Modifications #

Here's the updated version of your code with full attachment support:

// Grab the uploaded file from your form (adjust 'attachment' to match your file input's name attribute)
$uploadedFile = $_FILES['attachment'];

// Basic validation: Check if the file uploaded without errors
if ($uploadedFile['error'] !== UPLOAD_ERR_OK) {
    die("File upload failed with error code: " . $uploadedFile['error']);
}

// Read the file content and encode it to base64 (required format for SendGrid attachments)
$fileContent = file_get_contents($uploadedFile['tmp_name']);
$base64Content = base64_encode($fileContent);

// Build your SendGrid parameters, adding the attachment details
$params = array(
    'api_user' => $user,
    'api_key' => $pass,
    'to' => 'the recipient email',
    'subject' => 'New Careers',
    'html' => $email,
    'text' => $email,
    'from' => 'the sender email',
    // Add attachment metadata and content
    'attachments[0][filename]' => $uploadedFile['name'],
    'attachments[0][content]' => $base64Content,
    'attachments[0][type]' => $uploadedFile['type'],
    'attachments[0][disposition]' => 'attachment'
);

$request = $url . 'api/mail.send.json';
$session = curl_init($request);

// Curl will automatically handle multipart/form-data when passing an array to CURLOPT_POSTFIELDS
curl_setopt($session, CURLOPT_POST, true);
curl_setopt($session, CURLOPT_POSTFIELDS, $params);
curl_setopt($session, CURLOPT_HEADER, false);
curl_setopt($session, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
curl_setopt($session, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($session);
curl_close($session);

// Optional: Debug the response to check for SendGrid errors
var_dump(json_decode($response));

Key Details to Remember: #

• Form Requirement: Your HTML form must include <form ... enctype="multipart/form-data">—without this, the $_FILES superglobal won't receive the uploaded file.
• File Input Name: Replace 'attachment' in $_FILES['attachment'] with the actual name value of your form's file input (e.g., if your input is <input type="file" name="resume">, use $_FILES['resume']).
• Multiple Attachments: To support multiple files, loop through the $_FILES array and add additional entries like attachments[1][filename], attachments[1][content], etc., for each file.
• Extra Validation: The example includes basic error checking—you’ll likely want to add more rules (like file size limits or allowed file types) based on your use case.

内容的提问来源于stack exchange，提问作者EnexoOnoma