function isAlias($alias)
    {
        if (PEAR::isError($e = $this->_lock(LOCK_SH))) {
            return $e;
        }
        $ret = $this->_isChannelAlias($alias);
        $this->_unlock();
        return $ret;
    }
function isAlias($alias)
    {
        if (PEAR::isError($e = $this->_lock(LOCK_SH))) {
            return $e;
        }
        $ret = $this->_isChannelAlias($alias);
        $this->_unlock();
        return $ret;
    }
function isAlias ( $ alias ) { if ( PEAR :: isError ( $ e = $ this -> _lock ( LOCK_SH ) ) ) { return $ e ; } $ ret = $ this -> _isChannelAlias ( $ alias ) ; $ this -> _unlock ( ) ; return $ ret ; }
Determines whether the parameter is an alias of a channel
@param string
@return bool
Determines whether the parameter is an alias of a channel