In PHP, IMAP Functions, what are the functions that download the attached files ? (even if we don't explicitely want to download them)

Question

In PHP, IMAP Functions, what are the functions that download the attached files. I only want to download attached files if needed. I want to save bandwidth, but maybe some functions download them to get their information, or the structure of the email ? If I have an attachment of 2G, I don't want to download it, but want all the same to get the other part of the email (text parts, information about the email structure,...)

Answer 1

See imap_fetchbody and imap_fetchstructure. Messages with attachments are multi-part messages; you can tell imap_fetchbody which part you want to fetch.

Answer 2

See this code, should help you understand better:

$structure = imap_fetchstructure($mailbox, $index);

$attachments = array();
if(isset($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']);
     }
   }             
 } // for($i = 0; $i < count($structure->parts); $i++)
} // if(isset($structure->parts) && count($structure->parts))