How to send multiple files as attachments in an email using PHP?

Attaching and Sending Multiple Files via Email in PHP

The original task was to modify code that could only send one file attachment to send two or more files. This revised code addresses this requirement by allowing multiple file attachments to be sent in an email:

<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) {
    // Create arrays for file information
    $ftype = $_FILES['csv_file']['type'];
    $fname = $_FILES['csv_file']['name'];

    // Define files to be attached
    $files = $fname;

    // Email fields
    $to = "recipient@example.com";
    $from = "sender@example.com";
    $subject = "Attachments";
    $message = "Email with attached files";
    $headers = "From: $from";

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

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

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

    // Prepare each attachment
    foreach ($files as $key => $value) {
        $file = fopen($value, "rb");
        $data = fread($file, filesize($value));
        fclose($file);
        $data = chunk_split(base64_encode($data));
        $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$fname[$key]\"\n" .
        "Content-Disposition: attachment;\n" . " filename=\"$fname[$key]\"\n" .
        "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
        $message .= "--{$mime_boundary}\n";
    }

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

?></code>

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