What potential pitfalls should be considered when trying to send multiple files via PHPMail?

When sending multiple files via PHPMail, potential pitfalls to consider include file size limitations, server resource constraints, and email client compatibility issues. To address these concerns, it is recommended to compress files into a single archive before attaching them to the email. 

// Compress files into a zip archive before attaching to email
$zip = new ZipArchive();
$zipFileName = 'files.zip';

if ($zip->open($zipFileName, ZipArchive::CREATE) === TRUE) {
    $files = ['file1.txt', 'file2.jpg', 'file3.pdf']; // List of files to be attached
    foreach ($files as $file) {
        $zip->addFile($file);
    }
    $zip->close();

    // Send email with the zip file attached
    $to = 'recipient@example.com';
    $subject = 'Multiple Files Attached';
    $message = 'Please find attached files.';
    $headers = 'From: sender@example.com';
    
    $fileAttachment = chunk_split(base64_encode(file_get_contents($zipFileName)));
    $attachment = "Content-Type: application/zip; name=\"" . $zipFileName . "\"\r\n";
    $attachment .= "Content-Transfer-Encoding: base64\r\n";
    $attachment .= "Content-Disposition: attachment\r\n";
    $attachment .= $fileAttachment;

    $result = mail($to, $subject, $message, $headers, $attachment);

    if ($result) {
        echo 'Email sent successfully with multiple files attached.';
    } else {
        echo 'Failed to send email.';
    }

    // Delete the zip file after sending the email
    unlink($zipFileName);
} else {
    echo 'Failed to create zip archive.';
}

Keywords

PHPMail multiple files attachments MIME file size restrictions

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