public function header($header) {
        foreach($this->_headers as $k => $v) {
            if (!strcasecmp($k, $header)) {
                return $v;
            }
        }
        
        return null;
    }
public function header($header) {
        foreach($this->_headers as $k => $v) {
            if (!strcasecmp($k, $header)) {
                return $v;
            }
        }
        
        return null;
    }
public function header ( $ header ) { foreach ( $ this -> _headers as $ k => $ v ) { if ( ! strcasecmp ( $ k , $ header ) ) { return $ v ; } } return null ; }
Get request header value

@access  public
@param   string  $header     Request header
@return  mixed   `null` if header is not set
Get request header value