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Last active July 10, 2023 13:02
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Multiple Email Attachments PHP from scratch
ini_set('display_errors', 1);
if(isset($_FILES) && (bool) $_FILES) {
$allowedExtensions = array("pdf","doc","docx","gif","jpeg","jpg","png","rtf","txt");
$files = array();
foreach($_FILES as $name=>$file) {
$file_name = $file['name'];
$temp_name = $file['tmp_name'];
$file_type = $file['type'];
$path_parts = pathinfo($file_name);
$ext = $path_parts['extension'];
if(!in_array($ext,$allowedExtensions)) {
die("File $file_name has the extensions $ext which is not allowed");
// email fields: to, from, subject, and so on
$to = "<<TO EMAIL>>";
$from = "<<FROM EMAIL>>";
$subject ="test attachment";
$message = "this is a test 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
$file = fopen($files[$x]['tmp_name'],"rb");
$data = fread($file,filesize($files[$x]['tmp_name']));
$data = chunk_split(base64_encode($data));
$name = $files[$x]['name'];
$message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$name\"\n" .
"Content-Disposition: attachment;\n" . " filename=\"$name\"\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>";
<form method="post" action="attachments.php" enctype="multipart/form-data">
<input type="file" name="attach1"/>
<input type="submit" value="submit"/>
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Hi I could really use your help. This code works great, however if I dont attach any image or attach less than 3 images ( given my contact form has 3 file type input) the form doesn't gets submitted. What logic can I use to achieve that? so the code works even when no images are chosen or less than 3 or for that matter any amount? Thank you

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Kennedy-Manasseh commented Aug 30, 2017

Hi, could this work with WordPress by adding it above the <?php get_header(); ?>

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mariamghalleb commented Oct 20, 2017

hey good job!

how can i do this with an < input multiple > ?
Thank you !

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