(PHP 4, PHP 5, PHP 7)
imap_list — Read the list of mailboxes
$imap_stream
   , string $ref
   , string $pattern
   )Read the list of mailboxes.
imap_streamAn IMAP stream returned by imap_open().
ref
       ref should normally be just the server
       specification as described in imap_open().
      
patternSpecifies where in the mailbox hierarchy to start searching.
There are two special characters you can
pass as part of the pattern:
'*' and '%'.
'*' means to return all mailboxes. If you pass
pattern as '*', you will
get a list of the entire mailbox hierarchy.
'%'
means to return the current level only.
'%' as the pattern
parameter will return only the top level
mailboxes; '~/mail/%' on UW_IMAPD will return every mailbox in the ~/mail directory, but none in subfolders of that directory.
Returns an array containing the names of the mailboxes.
Example #1 imap_list() example
<?php
$mbox = imap_open("{imap.example.org}", "username", "password", OP_HALFOPEN)
      or die("can't connect: " . imap_last_error());
$list = imap_list($mbox, "{imap.example.org}", "*");
if (is_array($list)) {
    foreach ($list as $val) {
        echo imap_utf7_decode($val) . "\n";
    }
} else {
    echo "imap_list failed: " . imap_last_error() . "\n";
}
imap_close($mbox);
?>