If you want to disable the quotas again, set them to -1.
$mbox = imap_open ("{your.imap.host:143}", "mailadmin", "password");
if(!imap_set_quota($mbox, "user.kalowsky", -1)) {
    print "Error in deleting quota\n";
    return;
}
imap_close($mbox);
(PHP 4 >= 4.0.5, PHP 5, PHP 7)
imap_set_quota — Sets a quota for a given mailbox
$imap
   , string $quota_root
   , int $mailbox_size
   ) : boolSets an upper limit quota on a per mailbox basis.
imap_stream
Un flux IMAP întors de imap_open().
quota_root
       The mailbox to have a quota set. This should follow the IMAP standard
       format for a mailbox: user.name.
      
mailbox_size
       The maximum size (in KB) for the quota_root
      
   Întoarce valoarea true în cazul
succesului sau false în cazul eșecului.
  
Example #1 imap_set_quota() example
<?php
$mbox = imap_open("{imap.example.org:143}", "mailadmin", "password");
if (!imap_set_quota($mbox, "user.kalowsky", 3000)) {
    echo "Error in setting quota\n";
    return;
}
imap_close($mbox);
?>
This function is currently only available to users of the c-client2000 or greater library.
   The given imap must be opened as the mail
   administrator, other wise this function will fail.
  
 add a note
 add a note
  
If you want to disable the quotas again, set them to -1.
$mbox = imap_open ("{your.imap.host:143}", "mailadmin", "password");
if(!imap_set_quota($mbox, "user.kalowsky", -1)) {
    print "Error in deleting quota\n";
    return;
}
imap_close($mbox);
