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1.打開后臺入口文件admin.php

header('location:index.php?m=admin');

跳轉(zhuǎn)到index.php并且m=admin

2.打開index.php

define('PHPCMS_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR);

include PHPCMS_PATH.'/phpcms/base.php';

pc_base::creat_app();

定義了根目錄,包含了框架的入口文件base.php,并且使用類靜態(tài)方法creat_app()

3.打開框架入口文件base.php

define('IN_PHPCMS', true);

//PHPCMS框架路徑
define('PC_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR);

if(!defined('PHPCMS_PATH')) define('PHPCMS_PATH', PC_PATH.'..'.DIRECTORY_SEPARATOR);

//緩存文件夾地址
define('CACHE_PATH', PHPCMS_PATH.'caches'.DIRECTORY_SEPARATOR);

//主機(jī)協(xié)議
define('SITE_PROTOCOL', isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://');

//當(dāng)前訪問的主機(jī)名
define('SITE_URL', (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ''));

//來源
define('HTTP_REFERER', isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '');

//系統(tǒng)開始時(shí)間
define('SYS_START_TIME', microtime());

//加載公用函數(shù)庫
pc_base::load_sys_func('global');
pc_base::load_sys_func('extention');
pc_base::auto_load_func();

pc_base::load_config('system','errorlog') ? set_error_handler('my_error_handler') : error_reporting(E_ERROR | E_WARNING | E_PARSE);
//設(shè)置本地時(shí)差
function_exists('date_default_timezone_set') && date_default_timezone_set(pc_base::load_config('system','timezone'));

define('CHARSET' ,pc_base::load_config('system','charset'));
//輸出頁面字符集
header('Content-type: text/html; charset='.CHARSET);

define('SYS_TIME', time());

//定義網(wǎng)站根路徑
define('WEB_PATH',pc_base::load_config('system','web_path'));
//js 路徑
define('JS_PATH',pc_base::load_config('system','js_path'));
//css 路徑
define('CSS_PATH',pc_base::load_config('system','css_path'));
//img 路徑
define('IMG_PATH',pc_base::load_config('system','img_path'));
//動態(tài)程序路徑
define('APP_PATH',pc_base::load_config('system','app_path'));

//應(yīng)用靜態(tài)文件路徑
define('PLUGIN_STATICS_PATH',WEB_PATH.'statics/plugin/');

if(pc_base::load_config('system','gzip') && function_exists('ob_gzhandler')) {
  ob_start('ob_gzhandler');
} else {
  ob_start();
}

class pc_base {

  /**
   * 初始化應(yīng)用程序
   */
  public static function creat_app() {
    return self::load_sys_class('application');
  }
  /**
   * 加載系統(tǒng)類方法
   * @param string $classname 類名
   * @param string $path 擴(kuò)展地址
   * @param intger $initialize 是否初始化
   */
  public static function load_sys_class($classname, $path = '', $initialize = 1) {
      return self::_load_class($classname, $path, $initialize);
  }

  /**
   * 加載應(yīng)用類方法
   * @param string $classname 類名
   * @param string $m 模塊
   * @param intger $initialize 是否初始化
   */
  public static function load_app_class($classname, $m = '', $initialize = 1) {
    $m = empty($m) && defined('ROUTE_M') ? ROUTE_M : $m;
    if (empty($m)) return false;
    return self::_load_class($classname, 'modules'.DIRECTORY_SEPARATOR.$m.DIRECTORY_SEPARATOR.'classes', $initialize);
  }

  /**
   * 加載數(shù)據(jù)模型
   * @param string $classname 類名
   */
  public static function load_model($classname) {
    return self::_load_class($classname,'model');
  }

  /**
   * 加載類文件函數(shù)
   * @param string $classname 類名
   * @param string $path 擴(kuò)展地址
   * @param intger $initialize 是否初始化
   */
  private static function _load_class($classname, $path = '', $initialize = 1) {
    static $classes = array();
    if (empty($path)) $path = 'libs'.DIRECTORY_SEPARATOR.'classes';

    $key = md5($path.$classname);
    if (isset($classes[$key])) {
      if (!empty($classes[$key])) {
        return $classes[$key];
      } else {
        return true;
      }
    }
    if (file_exists(PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php')) {
      include PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php';
      $name = $classname;
      if ($my_path = self::my_path(PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php')) {
        include $my_path;
        $name = 'MY_'.$classname;
      }
      if ($initialize) {
        $classes[$key] = new $name;
      } else {
        $classes[$key] = true;
      }
      return $classes[$key];
    } else {
      return false;
    }
  }

  /**
   * 加載系統(tǒng)的函數(shù)庫
   * @param string $func 函數(shù)庫名
   */
  public static function load_sys_func($func) {
    return self::_load_func($func);
  }

  /**
   * 自動加載autoload目錄下函數(shù)庫
   * @param string $func 函數(shù)庫名
   */
  public static function auto_load_func($path='') {
    return self::_auto_load_func($path);
  }

  /**
   * 加載應(yīng)用函數(shù)庫
   * @param string $func 函數(shù)庫名
   * @param string $m 模型名
   */
  public static function load_app_func($func, $m = '') {
    $m = empty($m) && defined('ROUTE_M') ? ROUTE_M : $m;
    if (empty($m)) return false;
    return self::_load_func($func, 'modules'.DIRECTORY_SEPARATOR.$m.DIRECTORY_SEPARATOR.'functions');
  }

  /**
   * 加載插件類庫
   */
  public static function load_plugin_class($classname, $identification = '' ,$initialize = 1) {
    $identification = empty($identification) && defined('PLUGIN_ID') ? PLUGIN_ID : $identification;
    if (empty($identification)) return false;
    return pc_base::load_sys_class($classname, 'plugin'.DIRECTORY_SEPARATOR.$identification.DIRECTORY_SEPARATOR.'classes', $initialize);
  }

  /**
   * 加載插件函數(shù)庫
   * @param string $func 函數(shù)文件名稱
   * @param string $identification 插件標(biāo)識
   */
  public static function load_plugin_func($func,$identification) {
    static $funcs = array();
    $identification = empty($identification) && defined('PLUGIN_ID') ? PLUGIN_ID : $identification;
    if (empty($identification)) return false;
    $path = 'plugin'.DIRECTORY_SEPARATOR.$identification.DIRECTORY_SEPARATOR.'functions'.DIRECTORY_SEPARATOR.$func.'.func.php';
    $key = md5($path);
    if (isset($funcs[$key])) return true;
    if (file_exists(PC_PATH.$path)) {
      include PC_PATH.$path;
    } else {
      $funcs[$key] = false;
      return false;
    }
    $funcs[$key] = true;
    return true;
  }

  /**
   * 加載插件數(shù)據(jù)模型
   * @param string $classname 類名
   */
  public static function load_plugin_model($classname,$identification) {
    $identification = empty($identification) && defined('PLUGIN_ID') ? PLUGIN_ID : $identification;
    $path = 'plugin'.DIRECTORY_SEPARATOR.$identification.DIRECTORY_SEPARATOR.'model';
    return self::_load_class($classname,$path);
  }

  /**
   * 加載函數(shù)庫
   * @param string $func 函數(shù)庫名
   * @param string $path 地址
   */
  private static function _load_func($func, $path = '') {
    static $funcs = array();
    if (empty($path)) $path = 'libs'.DIRECTORY_SEPARATOR.'functions';//默認(rèn)函數(shù)地址在lib function
    $path .= DIRECTORY_SEPARATOR.$func.'.func.php';
    $key = md5($path);
    if (isset($funcs[$key])) return true;
    if (file_exists(PC_PATH.$path)) {
      include PC_PATH.$path;
    } else {
      $funcs[$key] = false;
      return false;
    }
    $funcs[$key] = true;
    return true;
  }

  /**
   * 加載函數(shù)庫
   * @param string $func 函數(shù)庫名
   * @param string $path 地址
   */
  private static function _auto_load_func($path = '') {
    if (empty($path)) $path = 'libs'.DIRECTORY_SEPARATOR.'functions'.DIRECTORY_SEPARATOR.'autoload';
    $path .= DIRECTORY_SEPARATOR.'*.func.php';
    $auto_funcs = glob(PC_PATH.DIRECTORY_SEPARATOR.$path);
    if(!empty($auto_funcs) && is_array($auto_funcs)) {
      foreach($auto_funcs as $func_path) {
        include $func_path;
      }
    }
  }
  /**
   * 是否有自己的擴(kuò)展文件
   * @param string $filepath 路徑
   */
  public static function my_path($filepath) {
    $path = pathinfo($filepath);
    if (file_exists($path['dirname'].DIRECTORY_SEPARATOR.'MY_'.$path['basename'])) {
      return $path['dirname'].DIRECTORY_SEPARATOR.'MY_'.$path['basename'];
    } else {
      return false;
    }
  }

  /**
   * 加載配置文件
   * @param string $file 配置文件
   * @param string $key  要獲取的配置薦
   * @param string $default  默認(rèn)配置。當(dāng)獲取配置項(xiàng)目失敗時(shí)該值發(fā)生作用。
   * @param boolean $reload 強(qiáng)制重新加載。
   */
  public static function load_config($file, $key = '', $default = '', $reload = false) {
    static $configs = array();
    if (!$reload && isset($configs[$file])) {
      if (empty($key)) {
        return $configs[$file];
      } elseif (isset($configs[$file][$key])) {
        return $configs[$file][$key];
      } else {
        return $default;
      }
    }
    $path = CACHE_PATH.'configs'.DIRECTORY_SEPARATOR.$file.'.php';
    if (file_exists($path)) {
      $configs[$file] = include $path;
    }
    if (empty($key)) {
      return $configs[$file];
    } elseif (isset($configs[$file][$key])) {
      return $configs[$file][$key];
    } else {
      return $default;
    }
  }
}

4.打開框架類庫文件下的application.class.php文件

5.打開index.php?m=admin&a=index&c=login登錄頁面

defined('IN_PHPCMS') or exit('No permission resources.');
pc_base::load_app_class('admin','admin',0);

判斷是否從框架入口文件進(jìn)入，然后加載admin模塊下的admin類文件

class index extends admin {
  public function __construct() {
    parent::__construct(); //調(diào)用父類構(gòu)造方法
    $this->db = pc_base::load_model('admin_model');
    $this->menu_db = pc_base::load_model('menu_model');
    $this->panel_db = pc_base::load_model('admin_panel_model');
  }

然后使用構(gòu)造方法加載使用到的模型文件（MVC中的M），然后看父類的構(gòu)造方法

6.打開框架類文件admin.class.php

這個(gè)類文件，這個(gè)模塊中的最高級類，做了很多判斷操作，以及本模塊一些必須的東西（加載模板）

7.然后讓我們看admin_model.class.php類

defined('IN_PHPCMS') or exit('No permission resources.');
pc_base::load_sys_class('model', '', 0);
class admin_model extends model {
  public function __construct() {
    $this->db_config = pc_base::load_config('database');
    $this->db_setting = 'default';
    $this->table_name = 'admin';
    parent::__construct();
  }
}

admin_model extends model繼承model然后使用了一些方法

<?php
/**
 *  model.class.php 數(shù)據(jù)模型基類
 *
 * @copyright			(C) 2005-2010 PHPCMS
 * @license				http://www.phpcms.cn/license/
 * @lastmodify			2010-6-7
 */
defined('IN_PHPCMS') or exit('Access Denied');
pc_base::load_sys_class('db_factory', '', 0);
class model {

  //數(shù)據(jù)庫配置
  protected $db_config = '';
  //數(shù)據(jù)庫連接
  protected $db = '';
  //調(diào)用數(shù)據(jù)庫的配置項(xiàng)
  protected $db_setting = 'default';
  //數(shù)據(jù)表名
  protected $table_name = '';
  //表前綴
  public  $db_tablepre = '';

  public function __construct() {
    if (!isset($this->db_config[$this->db_setting])) {
      $this->db_setting = 'default';
    }
    $this->table_name = $this->db_config[$this->db_setting]['tablepre'].$this->table_name;
    $this->db_tablepre = $this->db_config[$this->db_setting]['tablepre'];
    $this->db = db_factory::get_instance($this->db_config)->get_database($this->db_setting);
  }

  /**
   * 執(zhí)行sql查詢
   * @param $where 		查詢條件[例`name`='$name']
   * @param $data 		需要查詢的字段值[例`name`,`gender`,`birthday`]
   * @param $limit 		返回結(jié)果范圍[例：10或10,10 默認(rèn)為空]
   * @param $order 		排序方式	[默認(rèn)按數(shù)據(jù)庫默認(rèn)方式排序]
   * @param $group 		分組方式	[默認(rèn)為空]
   * @param $key          返回?cái)?shù)組按鍵名排序
   * @return array		查詢結(jié)果集數(shù)組
   */
  final public function select($where = '', $data = '*', $limit = '', $order = '', $group = '', $key='') {
    if (is_array($where)) $where = $this->sqls($where);
    return $this->db->select($data, $this->table_name, $where, $limit, $order, $group, $key);
  }

  /**
   * 查詢多條數(shù)據(jù)并分頁
   * @param $where
   * @param $order
   * @param $page
   * @param $pagesize
   * @return unknown_type
   */
  final public function listinfo($where = '', $order = '', $page = 1, $pagesize = 20, $key='', $setpages = 10,$urlrule = '',$array = array(), $data = '*') {
    $where = to_sqls($where);
    $this->number = $this->count($where);
    $page = max(intval($page), 1);
    $offset = $pagesize*($page-1);
    $this->pages = pages($this->number, $page, $pagesize, $urlrule, $array, $setpages);
    $array = array();
    if ($this->number > 0) {
      return $this->select($where, $data, "$offset, $pagesize", $order, '', $key);
    } else {
      return array();
    }
  }

  /**
   * 獲取單條記錄查詢
   * @param $where 		查詢條件
   * @param $data 		需要查詢的字段值[例`name`,`gender`,`birthday`]
   * @param $order 		排序方式	[默認(rèn)按數(shù)據(jù)庫默認(rèn)方式排序]
   * @param $group 		分組方式	[默認(rèn)為空]
   * @return array/null	數(shù)據(jù)查詢結(jié)果集,如果不存在，則返回空
   */
  final public function get_one($where = '', $data = '*', $order = '', $group = '') {
    if (is_array($where)) $where = $this->sqls($where);
    return $this->db->get_one($data, $this->table_name, $where, $order, $group);
  }

  /**
   * 直接執(zhí)行sql查詢
   * @param $sql							查詢sql語句
   * @return	boolean/query resource		如果為查詢語句，返回資源句柄，否則返回true/false
   */
  final public function query($sql) {
    $sql = str_replace('phpcms_', $this->db_tablepre, $sql);
    return $this->db->query($sql);
  }

  /**
   * 執(zhí)行添加記錄操作
   * @param $data 		要增加的數(shù)據(jù)，參數(shù)為數(shù)組。數(shù)組key為字段值，數(shù)組值為數(shù)據(jù)取值
   * @param $return_insert_id 是否返回新建ID號
   * @param $replace 是否采用 replace into的方式添加數(shù)據(jù)
   * @return boolean
   */
  final public function insert($data, $return_insert_id = false, $replace = false) {
    return $this->db->insert($data, $this->table_name, $return_insert_id, $replace);
  }

  /**
   * 獲取最后一次添加記錄的主鍵號
   * @return int
   */
  final public function insert_id() {
    return $this->db->insert_id();
  }

  /**
   * 執(zhí)行更新記錄操作
   * @param $data 		要更新的數(shù)據(jù)內(nèi)容，參數(shù)可以為數(shù)組也可以為字符串，建議數(shù)組。
   * 						為數(shù)組時(shí)數(shù)組key為字段值，數(shù)組值為數(shù)據(jù)取值
   * 						為字符串時(shí)[例：`name`='phpcms',`hits`=`hits`+1]。
   *						為數(shù)組時(shí)[例: array('name'=>'phpcms','password'=>'123456')]
   *						數(shù)組的另一種使用array('name'=>'+=1', 'base'=>'-=1');程序會自動解析為`name` = `name` + 1, `base` = `base` - 1
   * @param $where 		更新數(shù)據(jù)時(shí)的條件,可為數(shù)組或字符串
   * @return boolean
   */
  final public function update($data, $where = '') {
    if (is_array($where)) $where = $this->sqls($where);
    return $this->db->update($data, $this->table_name, $where);
  }

  /**
   * 執(zhí)行刪除記錄操作
   * @param $where 		刪除數(shù)據(jù)條件,不充許為空。
   * @return boolean
   */
  final public function delete($where) {
    if (is_array($where)) $where = $this->sqls($where);
    return $this->db->delete($this->table_name, $where);
  }

  /**
   * 計(jì)算記錄數(shù)
   * @param string/array $where 查詢條件
   */
  final public function count($where = '') {
    $r = $this->get_one($where, "COUNT(*) AS num");
    return $r['num'];
  }

  /**
   * 將數(shù)組轉(zhuǎn)換為SQL語句
   * @param array $where 要生成的數(shù)組
   * @param string $font 連接串。
   */
  final public function sqls($where, $font = ' AND ') {
    if (is_array($where)) {
      $sql = '';
      foreach ($where as $key=>$val) {
        $sql .= $sql ? " $font `$key` = '$val' " : " `$key` = '$val'";
      }
      return $sql;
    } else {
      return $where;
    }
  }

  /**
   * 獲取最后數(shù)據(jù)庫操作影響到的條數(shù)
   * @return int
   */
  final public function affected_rows() {
    return $this->db->affected_rows();
  }

  /**
   * 獲取數(shù)據(jù)表主鍵
   * @return array
   */
  final public function get_primary() {
    return $this->db->get_primary($this->table_name);
  }

  /**
   * 獲取表字段
   * @param string $table_name    表名
   * @return array
   */
  final public function get_fields($table_name = '') {
    if (empty($table_name)) {
      $table_name = $this->table_name;
    } else {
      $table_name = $this->db_tablepre.$table_name;
    }
    return $this->db->get_fields($table_name);
  }

  /**
   * 檢查表是否存在
   * @param $table 表名
   * @return boolean
   */
  final public function table_exists($table){
    return $this->db->table_exists($this->db_tablepre.$table);
  }

  /**
   * 檢查字段是否存在
   * @param $field 字段名
   * @return boolean
   */
  public function field_exists($field) {
    $fields = $this->db->get_fields($this->table_name);
    return array_key_exists($field, $fields);
  }

  final public function list_tables() {
    return $this->db->list_tables();
  }
  /**
   * 返回?cái)?shù)據(jù)結(jié)果集
   * @param $query （mysql_query返回值）
   * @return array
   */
  final public function fetch_array() {
    $data = array();
    while($r = $this->db->fetch_next()) {
      $data[] = $r;
    }
    return $data;
  }

  /**
   * 返回?cái)?shù)據(jù)庫版本號
   */
  final public function version() {
    return $this->db->version();
  }
}

包含了數(shù)據(jù)庫操作封裝，然后數(shù)據(jù)庫的連接，大致思路就是如此