如何使用 PHP 将多个文件作为电子邮件附件发送？

在 PHP 中通过电子邮件附加和发送多个文件

最初的任务是修改只能发送一个文件附件的代码以发送两个文件附件或更多文件。此修订后的代码通过允许在电子邮件中发送多个文件附件来满足此要求：

<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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