common.php

完美的在线教育系统

        $pageID = empty($pageID) ? $this->_currentPage : $pageID;

        if (!isset($this->_pageData)) {
            $this->_generatePageData();
        }
        if (!empty($this->_pageData[$pageID])) {
            return $this->_pageData[$pageID];
        }
        return array();
    }

    // }}}
    // {{{ getPageIdByOffset()

    /**
     * Returns pageID for given offset
     *
     * @param $index Offset to get pageID for
     * @return int PageID for given offset
     */
    function getPageIdByOffset($index)
    {
        $msg = '<b>PEAR::Pager Error:</b>'
              .' function "getPageIdByOffset()" not implemented.';
        return $this->raiseError($msg, ERROR_PAGER_NOT_IMPLEMENTED);
    }

    // }}}
    // {{{ getOffsetByPageId()

    /**
     * Returns offsets for given pageID. Eg, if you
     * pass it pageID one and your perPage limit is 10
     * it will return (1, 10). PageID of 2 would
     * give you (11, 20).
     *
     * @param integer PageID to get offsets for
     * @return array  First and last offsets
     * @access public
     */
    function getOffsetByPageId($pageid = null)
    {
        $pageid = isset($pageid) ? $pageid : $this->_currentPage;
        if (!isset($this->_pageData)) {
            $this->_generatePageData();
        }

        if (isset($this->_pageData[$pageid]) || is_null($this->_itemData)) {
            return array(
                        max(($this->_perPage * ($pageid - 1)) + 1, 1),
                        min($this->_totalItems, $this->_perPage * $pageid)
                   );
        } else {
            return array(0, 0);
        }
    }

    // }}}
    // {{{ getPageRangeByPageId()

    /**
     * @param integer PageID to get offsets for
     * @return array  First and last offsets
     */
    function getPageRangeByPageId($pageID)
    {
        $msg = '<b>PEAR::Pager Error:</b>'
              .' function "getPageRangeByPageId()" not implemented.';
        return $this->raiseError($msg, ERROR_PAGER_NOT_IMPLEMENTED);
    }

    // }}}
    // {{{ getLinks()

    /**
     * Returns back/next/first/last and page links,
     * both as ordered and associative array.
     *
     * NB: in original PEAR::Pager this method accepted two parameters,
     * $back_html and $next_html. Now the only parameter accepted is
     * an integer ($pageID), since the html text for prev/next links can
     * be set in the factory. If a second parameter is provided, then
     * the method act as it previously did. This hack was done to mantain
     * backward compatibility only.
     *
     * @param integer $pageID Optional pageID. If specified, links
     *                for that page are provided instead of current one.  [ADDED IN NEW PAGER VERSION]
     * @param  string $next_html HTML to put inside the next link [deprecated: use the factory instead]
     * @return array back/next/first/last and page links
     */
    function getLinks($pageID=null, $next_html='')
    {
        $msg = '<b>PEAR::Pager Error:</b>'
              .' function "getLinks()" not implemented.';
        return $this->raiseError($msg, ERROR_PAGER_NOT_IMPLEMENTED);
    }

    // }}}
    // {{{ getCurrentPageID()

    /**
     * Returns ID of current page
     *
     * @return integer ID of current page
     */
    function getCurrentPageID()
    {
        return $this->_currentPage;
    }

    // }}}
    // {{{ getNextPageID()

    /**
     * Returns next page ID. If current page is last page
	 * this function returns FALSE
	 *
	 * @return mixed Next page ID
     */
	function getNextPageID()
	{
		return ($this->getCurrentPageID() == $this->numPages() ? false : $this->getCurrentPageID() + 1);
	}

	// }}}
    // {{{ getPreviousPageID()

    /**
     * Returns previous page ID. If current page is first page
	 * this function returns FALSE
	 *
	 * @return mixed Previous pages' ID
     */
	function getPreviousPageID()
	{
		return $this->isFirstPage() ? false : $this->getCurrentPageID() - 1;
	}

    // }}}
    // {{{ numItems()

    /**
     * Returns number of items
     *
     * @return int Number of items
     */
    function numItems()
    {
        return $this->_totalItems;
    }

    // }}}
    // {{{ numPages()

    /**
     * Returns number of pages
     *
     * @return int Number of pages
     */
    function numPages()
    {
        return (int)$this->_totalPages;
    }

    // }}}
    // {{{ isFirstPage()

    /**
     * Returns whether current page is first page
     *
     * @return bool First page or not
     */
    function isFirstPage()
    {
        return ($this->_currentPage < 2);
    }

    // }}}
    // {{{ isLastPage()

    /**
     * Returns whether current page is last page
     *
     * @return bool Last page or not
     */
    function isLastPage()
    {
        return ($this->_currentPage == $this->_totalPages);
    }

    // }}}
    // {{{ isLastPageComplete()

    /**
     * Returns whether last page is complete
     *
     * @return bool Last age complete or not
     */
    function isLastPageComplete()
    {
        return !($this->_totalItems % $this->_perPage);
    }

    // }}}
    // {{{ _generatePageData()

    /**
     * Calculates all page data
     * @access private
     */
    function _generatePageData()
    {
        // Been supplied an array of data?
        if (!is_null($this->_itemData)) {
            $this->_totalItems = count($this->_itemData);
        }
        $this->_totalPages = ceil((float)$this->_totalItems / (float)$this->_perPage);
        $i = 1;
        if (!empty($this->_itemData)) {
            foreach ($this->_itemData as $key => $value) {
                $this->_pageData[$i][$key] = $value;
                if (count($this->_pageData[$i]) >= $this->_perPage) {
                    $i++;
                }
            }
        } else {
            $this->_pageData = array();
        }

        //prevent URL modification
        $this->_currentPage = min($this->_currentPage, $this->_totalPages);
    }

    // }}}
    // {{{ _renderLink()

    /**
     * Renders a link using the appropriate method
     *
     * @param altText Alternative text for this link (title property)
     * @param linkText Text contained by this link
     * @return string The link in string form
     * @access private
     */
    function _renderLink($altText, $linkText)
    {
        if ($this->_httpMethod == 'GET') {
            if ($this->_append) {
                $href = '?' . $this->_http_build_query_wrapper($this->_linkData);
            } else {
                $href = str_replace('%d', $this->_linkData[$this->_urlVar], $this->_fileName);
            }
            return sprintf('<a href="%s"%s%s%s title="%s">%s</a>',
                           htmlentities($this->_url . $href),
                           empty($this->_classString) ? '' : ' '.$this->_classString,
                           empty($this->_attributes)  ? '' : ' '.$this->_attributes,
                           empty($this->_accesskey)   ? '' : ' accesskey="'.$this->_linkData[$this->_urlVar].'"',
                           $altText,
                           $linkText
            );
        } elseif ($this->_httpMethod == 'POST') {
            return sprintf("<a href='javascript:void(0)' onclick='%s'%s%s%s title='%s'>%s</a>",
                           $this->_generateFormOnClick($this->_url, $this->_linkData),
                           empty($this->_classString) ? '' : ' '.$this->_classString,
                           empty($this->_attributes)  ? '' : ' '.$this->_attributes,
                           empty($this->_accesskey)   ? '' : ' accesskey=\''.$this->_linkData[$this->_urlVar].'\'',
                           $altText,
                           $linkText
            );
        }
        return '';
    }

    // }}}
    // {{{ _generateFormOnClick()

    /**
     * Mimics http_build_query() behavior in the way the data
     * in $data will appear when it makes it back to the server.
     *  For example:
     * $arr =  array('array' => array(array('hello', 'world'),
     *                                'things' => array('stuff', 'junk'));
     * http_build_query($arr)
     * and _generateFormOnClick('foo.php', $arr)
     * will yield
     * $_REQUEST['array'][0][0] === 'hello'
     * $_REQUEST['array'][0][1] === 'world'
     * $_REQUEST['array']['things'][0] === 'stuff'
     * $_REQUEST['array']['things'][1] === 'junk'
     *
     * However, instead of  generating a query string, it generates
     * Javascript to create and submit a form.
     *
     * @param string $formAction where the form should be submitted
     * @param array  $data the associative array of names and values
     * @return string A string of javascript that generates a form and submits it
     * @access private
     */
    function _generateFormOnClick($formAction, $data)
    {
        // Check we have an array to work with
        if (!is_array($data)) {
            trigger_error(
                '_generateForm() Parameter 1 expected to be Array or Object. Incorrect value given.',
                E_USER_WARNING
            );
            return false;
        }

        if (!empty($this->_formID)) {
            $str = 'var form = document.getElementById("'.$this->_formID.'"); var input = ""; ';
        } else {
            $str = 'var form = document.createElement("form"); var input = ""; ';
        }
        
        // We /shouldn't/ need to escape the URL ...
        $str .= sprintf('form.action = "%s"; ', htmlentities($formAction));
        $str .= sprintf('form.method = "%s"; ', $this->_httpMethod);
        foreach ($data as $key => $val) {
            $str .= $this->_generateFormOnClickHelper($val, $key);
        }

        if (empty($this->_formID)) {
            $str .= 'document.getElementsByTagName("body")[0].appendChild(form);';
        }
        
        $str .= 'form.submit(); return false;';
        return $str;
    }

    // }}}
    // {{{ _generateFormOnClickHelper

    /**
     * This is used by _generateFormOnClick(). 
     * Recursively processes the arrays, objects, and literal values.
     *
     * @param data Data that should be rendered
     * @param prev The name so far
     * @return string A string of Javascript that creates form inputs
     *                representing the data
     * @access private
     */
    function _generateFormOnClickHelper($data, $prev = '')
    {
        $str = '';
        if (is_array($data) || is_object($data)) {
            // foreach key/visible member
            foreach ((array)$data as $key => $val) {
                // append [$key] to prev
                $tempKey = sprintf('%s[%s]', $prev, $key);
                $str .= $this->_generateFormOnClickHelper($val, $tempKey);
            }
        } else {  // must be a literal value
            // escape newlines and carriage returns
            $search  = array("\n", "\r");
            $replace = array('\n', '\n');
            $escapedData = str_replace($search, $replace, $data);
            // am I forgetting any dangerous whitespace?
            // would a regex be faster?
            // if it's already encoded, don't encode it again
            if (!$this->_isEncoded($escapedData)) {
                $escapedData = urlencode($escapedData);
            }
            $escapedData = htmlentities($escapedData, ENT_QUOTES, 'UTF-8');

            $str .= 'input = document.createElement("input"); ';
            $str .= 'input.type = "hidden"; ';
            $str .= sprintf('input.name = "%s"; ', $prev);
            $str .= sprintf('input.value = "%s"; ', $escapedData);
            $str .= 'form.appendChild(input); ';
        }
        return $str;
    }

    // }}}
    // {{{ _getLinksData()

    /**
     * Returns the correct link for the back/pages/next links
     *
     * @return array Data
     * @access private
     */
    function _getLinksData()
    {
        $qs = array();
        if ($this->_importQuery) {
            if ($this->_httpMethod == 'POST') {
                $qs = $_POST;
            } elseif ($this->_httpMethod == 'GET') {
                $qs = $_GET;
            }
        }
        if (count($this->_extraVars)){
            $this->_recursive_urldecode($this->_extraVars);
        }
        $qs = array_merge($qs, $this->_extraVars);
        foreach ($this->_excludeVars as $exclude) {
            if (array_key_exists($exclude, $qs)) {
                unset($qs[$exclude]);
            }
        }
        if (count($qs) && get_magic_quotes_gpc()){
            $this->_recursive_stripslashes($qs);
        }
        return $qs;
    }

    // }}}
    // {{{ _recursive_stripslashes()
    
    /**
     * Helper method
     * @param mixed $var
     * @access private
     */
    function _recursive_stripslashes(&$var)
    {
        if (is_array($var)) {
            foreach (array_keys($var) as $k) {
                $this->_recursive_stripslashes($var[$k]);
            }
        } else {
            $var = stripslashes($var);
        }
    }

    // }}}
    // {{{ _recursive_urldecode()

    /**
     * Helper method
     * @param mixed $var
     * @access private
     */
    function _recursive_urldecode(&$var)
    {
        if (is_array($var)) {
            foreach (array_keys($var) as $k) {
                $this->_recursive_urldecode($var[$k]);
            }
        } else {
            $trans_tbl = array_flip(get_html_translation_table(HTML_ENTITIES));
            $var = strtr($var, $trans_tbl);
        }
    }

    // }}}
    // {{{ _getBackLink()

    /**
     * Returns back link
     *
     * @param $url  URL to use in the link  [deprecated: use the factory instead]
     * @param $link HTML to use as the link [deprecated: use the factory instead]
     * @return string The link
     * @access private
     */
    function _getBackLink($url='', $link='')
    {
        //legacy settings... the preferred way to set an option
        //now is passing it to the factory
        if (!empty($url)) {
            $this->_path = $url;
        }
        if (!empty($link)) {
            $this->_prevImg = $link;
        }
        $back = '';
        if ($this->_currentPage > 1) {
            $this->_linkData[$this->_urlVar] = $this->getPreviousPageID();
            $back = $this->_renderLink($this->_altPrev, $this->_prevImg)
                  . $this->_spacesBefore . $this->_spacesAfter;
        }
        return $back;
    }

    // }}}
    // {{{ _getPageLinks()

    /**
     * Returns pages link
     *
     * @param $url  URL to use in the link [deprecated: use the factory instead]
     * @return string Links
     * @access private
     */
    function _getPageLinks($url='')
    {
        $msg = '<b>PEAR::Pager Error:</b>'
              .' function "_getPageLinks()" not implemented.';
        return $this->raiseError($msg, ERROR_PAGER_NOT_IMPLEMENTED);
    }

    // }}}
    // {{{ _getNextLink()

    /**
     * Returns next link
     *
     * @param $url  URL to use in the link  [deprecated: use the factory instead]