roundcubemail/program/lib/Roundcube/rcube_imap_cache.php
function remove_index($mailbox = null, $remove = false)
    {
        // The index should be only removed from database when
        // UIDVALIDITY was detected or the mailbox is empty
        // otherwise use 'valid' flag to not loose HIGHESTMODSEQ value
        if ($remove) {
            $this->db->query(
                "DELETE FROM {$this->index_table}"
                ." WHERE `user_id` = ?"
                    .(strlen($mailbox) ? " AND `mailbox` = ".$this->db->quote($mailbox) : ""),
                $this->userid
            );
        }
        else {
            $this->db->query(
                "UPDATE {$this->index_table}"
                ." SET `valid` = 0"
                ." WHERE `user_id` = ?"
                    .(strlen($mailbox) ? " AND `mailbox` = ".$this->db->quote($mailbox) : ""),
                $this->userid
            );
        }

        if (strlen($mailbox)) {
            unset($this->icache[$mailbox]['index']);
            // Index removed, set flag to skip SELECT query in get_index()
            $this->icache[$mailbox]['index_queried'] = true;
        }
        else {
            $this->icache = array();
        }
    }
function remove_index($mailbox = null, $remove = false)
    {
        // The index should be only removed from database when
        // UIDVALIDITY was detected or the mailbox is empty
        // otherwise use 'valid' flag to not loose HIGHESTMODSEQ value
        if ($remove) {
            $this->db->query(
                "DELETE FROM {$this->index_table}"
                ." WHERE `user_id` = ?"
                    .(strlen($mailbox) ? " AND `mailbox` = ".$this->db->quote($mailbox) : ""),
                $this->userid
            );
        }
        else {
            $this->db->query(
                "UPDATE {$this->index_table}"
                ." SET `valid` = 0"
                ." WHERE `user_id` = ?"
                    .(strlen($mailbox) ? " AND `mailbox` = ".$this->db->quote($mailbox) : ""),
                $this->userid
            );
        }

        if (strlen($mailbox)) {
            unset($this->icache[$mailbox]['index']);
            // Index removed, set flag to skip SELECT query in get_index()
            $this->icache[$mailbox]['index_queried'] = true;
        }
        else {
            $this->icache = array();
        }
    }
function remove_index ( $ mailbox = null , $ remove = false ) { // The index should be only removed from database when // UIDVALIDITY was detected or the mailbox is empty // otherwise use 'valid' flag to not loose HIGHESTMODSEQ value if ( $ remove ) { $ this -> db -> query ( "DELETE FROM {$this->index_table}" . " WHERE `user_id` = ?" . ( strlen ( $ mailbox ) ? " AND `mailbox` = " . $ this -> db -> quote ( $ mailbox ) : "" ) , $ this -> userid ) ; } else { $ this -> db -> query ( "UPDATE {$this->index_table}" . " SET `valid` = 0" . " WHERE `user_id` = ?" . ( strlen ( $ mailbox ) ? " AND `mailbox` = " . $ this -> db -> quote ( $ mailbox ) : "" ) , $ this -> userid ) ; } if ( strlen ( $ mailbox ) ) { unset ( $ this -> icache [ $ mailbox ] [ 'index' ] ) ; // Index removed, set flag to skip SELECT query in get_index() $ this -> icache [ $ mailbox ] [ 'index_queried' ] = true ; } else { $ this -> icache = array ( ) ; } }
Clears index cache.

@param string  $mailbox     Folder name
@param bool    $remove      Enable to remove the DB row
Clears index cache .