How to Send Multiple File Attachments with Email in PHP?

Send Multiple File Attachments with Email in PHP

Introduction
When dealing with email communication involving the transfer of documents, you may occasionally need to attach multiple files rather than just a single one. PHP provides a robust platform for handling such email operations.

Understanding the Original Code
The original code you provided successfully sends a single file attachment. However, to attach multiple files, certain modifications are necessary.

Solution: Enhancements for Multiple File Attachment
The improved code below enables the sending of multiple files as attachments:

<code class="php"><form action="#" method="POST" enctype="multipart/form-data"  >
<input type="file" name="csv_file[]" />
<br/>
<input type="file" name="csv_file[]" />
<br/>
<input type="file" name="csv_file[]" />
<br/>
<input type="submit" name="upload" value="Upload" />
<br/>
</form>

<?php
if ($_POST) {
    $csv_files = array();
    $files = array();
    for ($i=0; $i < count($_FILES['csv_file']['name']); $i++){
        $csv_files[]       = $_FILES['csv_file']['name'][$i];
    }

    // array with filenames to be sent as attachments
    $files = $csv_files;

    // email fields: to, from, subject, and so on
    $to = "[email&#160;protected]";
    $from = "[email&#160;protected]";
    $subject = "My subject";
    $message = "My message";
    $headers = "From: $from";

    // boundary
    $semi_rand = md5(time());
    $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

    // headers for attachment
    $headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\"";

    // multipart boundary
    $message = "This is a multi-part message in MIME format.\n\n" . "--{$mime_boundary}\n" . "Content-Type: text/plain; charset=\"iso-8859-1\"\n" . "Content-Transfer-Encoding: 7bit\n\n" . $message . "\n\n";
    $message .= "--{$mime_boundary}\n";

    // preparing attachments
    for($x=0;$x<count($files);$x++){
        $file = fopen($files[$x],"rb");
        $data = fread($file,filesize($files[$x]));
        fclose($file);
        $data = chunk_split(base64_encode($data));
        $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$files[$x]\"\n" .
        "Content-Disposition: attachment;\n" . " filename=\"$files[$x]\"\n" .
        "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
        $message .= "--{$mime_boundary}\n";
    }

    // send
    $ok = @mail($to, $subject, $message, $headers);
    if ($ok) {
        echo "<p>mail sent to $to!</p>";
    } else {
        echo "<p>mail could not be sent!</p>";
    }
}
?></code>

Explanation:

• The form (
  ) block allows multiple files to be selected for upload.
• The loop iterates over uploaded files, capturing their names into the $csv_files array.
• The $files array is populated with filenames to be attached.
• The email body is multipart, containing text and attachments separated by boundaries (--{$mime_boundary}).
• Each attached file has a unique Content-Disposition to specify its filename and type.
• The email sends successfully with attachments if $ok is true.

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