今天追一個 Joomla 的問題，和 PHP 升級到 5.3 造成不相容有關。

結論：系統 Package (比如 PHP 5.2.X–> PHP 5.3.X) 不要亂升級，很容易出事！要很花時間去追問題。

特徵是「選單」會全部不見！在 httpd-error.log 會有類似下列的錯誤訊息。

PHP Warning:  Parameter 4 to JHTMLMenu::treerecurse() expected to be a reference, value given in \
        {Joomla}/libraries/joomla/html/html.php on line 87, referer: \
        http://{Joomla_site}//administrator/index.php?option=com_menus&task=view&menutype=mainmenu2
PHP Warning:  array_slice() expects parameter 1 to be array, null given in \
        {Joomla}/administrator/components/com_menus/models/list.php on line 143, referer: \
        http://{Joomla_site}//administrator/index.php?option=com_menus&task=view&menutype=mainmenu2
PHP Warning:  Invalid argument supplied for foreach() in \
        {Joomla}/administrator/components/com_menus/models/list.php on line 147, referer: \
        http://{Joomla_site}//administrator/index.php?option=com_menus&task=view&menutype=mainmenu2
PHP Warning:  Invalid argument supplied for foreach() in \
        {Joomla}/administrator/components/com_menus/views/list/view.php on line 65, referer: \
        http://{Joomla_site}//administrator/index.php?option=com_menus&task=view&menutype=mainmenu2
PHP Warning:  Invalid argument supplied for foreach() in \
        {Joomla}/administrator/components/com_menus/views/list/tmpl/default.php on line 69, referer: \
         http://{Joomla_site}//administrator/index.php?option=com_menus&task=view&menutype=mainmenu2

這個要修改 libraries/joomla/html/html.php 第 85 行的

if (is_callable( array( $className, $func ) ))
{
        $args = func_get_args();
        array_shift( $args );
        return call_user_func_array( array( $className, $func ), $args );
}
else

改成

if (is_callable( array( $className, $func ) ))
{
        $temp=func_get_args();
        array_shift( $temp );
        $args = array();
        foreach ($temp as $k => $v) {
                $args[] = &$temp[$k];
        }
        return call_user_func_array( array( $className, $func ), $args );
}
else

參考自此頁 

另外，httpd-error.log會有

PHP Warning:  Parameter 1 to modMainMenuHelper::buildXML() expected to be a reference, value \
          given in {Joomla}/libraries/joomla/cache/handler/callback.php on line 99

這個修改 modules/mod_mainmenu/helper.php 第 31 行， 由

function buildXML(&$params)

改成

function buildXML($params)

參考自此頁 

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