How can the validation process for file uploads in a PHP form mailer be improved to ensure only JPEG and PNG files are accepted?

To improve the validation process for file uploads in a PHP form mailer to ensure only JPEG and PNG files are accepted, you can check the file's MIME type using the `$_FILES` superglobal array and verify that it corresponds to either "image/jpeg" or "image/png". This will prevent any other file types from being uploaded. 

// Check if file is a valid JPEG or PNG
if ($_FILES['file']['type'] != 'image/jpeg' && $_FILES['file']['type'] != 'image/png') {
    echo 'Only JPEG and PNG files are allowed.';
    exit;
}

// Process file upload
// Your existing code for handling file uploads goes here

Keywords

file upload validation PHP form mailer JPEG PNG

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