Function to extract email attachments using PHP IMAP

Posted on 16th Feb 2014 by admin

function extract_attachments($connection, $message_number) {

$attachments = array();
$structure = imap_fetchstructure($connection, $message_number);

if(isset($structure->parts) && count($structure->parts)) {

for($i = 0; $i < count($structure->parts); $i++) {

$attachments[$i] = array(
'is_attachment' => false,
'filename' => '',
'name' => '',
'attachment' => ''
);

if($structure->parts[$i]->ifdparameters) {
foreach($structure->parts[$i]->dparameters as $object) {
if(strtolower($object->attribute) == 'filename') {
$attachments[$i]['is_attachment'] = true;
$attachments[$i]['filename'] = $object->value;
}
}
}

if($structure->parts[$i]->ifparameters) {
foreach($structure->parts[$i]->parameters as $object) {
if(strtolower($object->attribute) == 'name') {
$attachments[$i]['is_attachment'] = true;
$attachments[$i]['name'] = $object->value;
}
}
}

if($attachments[$i]['is_attachment']) {
$attachments[$i]['attachment'] = imap_fetchbody($connection, $message_number, $i+1);
if($structure->parts[$i]->encoding == 3) { // 3 = BASE64
$attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
}
elseif($structure->parts[$i]->encoding == 4) { // 4 = QUOTED-PRINTABLE
$attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
}
}

}

}

return $attachments;

}

can anyone please explain this code