Php 对非对象调用成员函数

我有一个模板类，可以解析TPL文件中的数组变量，也可以简单地显示纯HTML文件。parse函数工作正常，但display函数返回以下错误：

“致命错误：在第7行的C:\xampp\htdocs\clancms\controllers\home.php中对非对象调用成员函数display（）”

这是home.php

class Home extends Controller {

    function index(){

        echo $this->template->display('index_body.tpl');
    }

}

这是模板类

class Template {

    var $file = '';
    var $vars = '';
    var $themeID = '';
    var $themeTitle = '';
    var $themeDescription = '';
    var $themePath = '';


    function getTheme(){

        if($_SESSION['memberid'] != NULL){

            $query = "
                SELECT memberid, themeid
                FROM members
                WHERE memberID = '".$_SESSION['memberID']."
                LIMIT 1";

            if($query = mysql_query($query)){
                $member = mysql_fetch_assoc($query);


                $query = "
                    SELECT themeID, themeTitle, themeDescription, themePath
                    FROM {DB_PREF} 
                    WHERE themeID = ".$member['themeID']."
                    LIMIT 1";

                if($query = mysql_query($query)){
                    $theme = mysql_fetch_assoc($query);
                    $this->themeID = $theme['themeID'];
                    $this->themePath = BASE_PATH.'/templates/'.$theme['themePath'];
                    $this->themeTitle = $theme['themeTitle'];
                    $this->themeDescription = nl2br(htmlspecialchars($theme['themeDescription']));
                } else {
                    $this->themePath = BASE_PATH.'/templates/default';
                }

            } else {
                $this->themePath = BASE_PATH.'/templates/default';
            }

        } else {
            $this->themePath = BASE_PATH.'/templates/default';
        }

    }

    function parse($file, $vars){

    $this->getTheme();

        if(file_exists($this->themePath.'/'.$file)){
            $file = file_get_contents($this->themePath.'/'.$file);

            foreach($vars as $key => $val){
                $file = str_replace('{'.$key.'}', $val, $file);
            }
            echo $file;
        } else {
            die('Template parser error: the file \''.$this->themePath.'/'.$file.'\' does not exist!');
        }
    }

    function display($file){

        if(file_exists($this->themePath.'/'.$file)){
            $file = file_get_contents($this->themePath.'/'.$file);
            echo $file;
        } else {
            die('Template parser error: the file \''.$this->themePath.'/'.$file.'\' does not exist!');
        }

    }
}

更新

对不起，我忘了包括那个

<?php

class Controller {

    function Controller(){

        $this->initialize();

    }

    function initialize(){

        $classes = array(
                        'load' => 'Load',
                        'uri' => 'URI',
                        'config' => 'Config',
                        'template' => 'Template'
                        );

        foreach($classes as $var => $class){

            if(file_exists($this->app_path.'/classes/'.$class.'.php')){
                require_once(BASE_PATH.'/classes/'.$class.'.php');
                $this->$var =& new $class;
            } else {
                return FALSE;
            }

        }

    }

}

?>

---

未初始化主实例上的成员变量$template。某处需要调用

$this->template=new template（）或类似的东西

这可能应该在Home _构造或父控制器类中

根据您的控制器初始化函数，我假设给定类中的一个不存在文件，因此它会提前退出函数并返回false

回显正在加载的类，如果它能够到达数组的末尾，我会感到惊讶。
应该是这样的

function index(){

    echo $this->display('index_body.tpl');
}

类模板的文件名是Template.php而不是Template.php