如何使用 PHP 將多個文件作為電子郵件附件發送？

在PHP 中透過電子郵件附加和傳送多個檔案

最初的任務是修改只能傳送一個檔案附件的程式碼以發送兩個文件附件或更多文件。此修訂後的程式碼透過允許在電子郵件中發送多個文件附件來滿足此要求：

<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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