i would like to connect to an imap server an get the list of all the 
mailboxes a user has. 

the docu says : 
get_mailboxes : "If you want all mailboxes, pass pattern as an empty string. "

if i use : 
$result = imap_getmailboxes($mailbox,"{mailserver:143}","");

i get an array containing 1 object wich name attribute is- {mailserver:143}

but this line works:
$result = imap_getmailboxes($mailbox,"{mailserver:143}","*");

maybe change the docu to be better understandable .. 
THANK YOU