function decoderattachment($piecejointe, $coding) {
	switch ($coding) {
		case 1 :
			$piecejointe = imap_8bit ( $piecejointe );
			break;
		case 2 :
			$piecejointe = imap_binary ( $piecejointe );
			break;
		case 3 :
		case 5 :
		case 6 :
		case 7 :
			$piecejointe = imap_base64 ( $piecejointe );
			break;
		case 4 :
			$piecejointe = imap_qprint ( $piecejointe );
			break;
	}
	return $piecejointe;
}




<?php
require ('fpdf.php');
require_once ('function.php');

$authhost = "{imap.gmail.com:993/imap/ssl/novalidate-cert}";
$user = "ipamemail@gmail.com";
$pass = "imapemail";

if ($mbox = imap_open ($authhost, $user, $pass)) {
	$nombreMessage = imap_num_msg ($mbox);
	while ($nombreMessage > 0) {
		$structure = imap_fetchstructure($mbox, $nombreMessage);
		$headers = imap_headerinfo ($mbox, $nombreMessage);
		$datetime = $headers->date;
		$subject = $headers->subject;
		mb_internal_encoding ('UTF-8');
		$subject = mb_decode_mimeheader ($subject);
		$fichier = dirname (__FILE__)."/email/".$subject.".txt";

		if (isset ( $structure->parts )) {
			$attachment = array ();
			$text = array ();
			foreach ( $structure->parts as $part ) {
				if (isset ( $part->disposition) && $part->disposition == 'ATTACHMENT') {
					$attachment = $part;
				}else{
					$text = $part;
				}
			}
        	if ($attachment) {
				$ext = $part->subtype;
				$coding = $part->encoding;
				$piecejointe = imap_fetchbody ( $mbox, $nombreMessage, 2 );
        		echo decoderattachment($piecejointe, $coding);
				$dpiece = dirname ( __FILE__ ) . "/email/piecejointe/" . $subject . "." . $ext;
				$dp = fopen ( $dpiece, 'w=' );
				fwrite ( $dp, $piecejointe );
				fclose ( $dp );
			}
	}
}