程序入口文件 · php CI 框架源碼閱讀筆記

最近在學習CI框架，自己在按照代碼執行順序閱讀源碼。做了一些筆記。與其自己珍藏不如拿出來和大家分享本人并非大牛，是一名處于成長初期的phper，難免有錯誤的地方。還希望大家能給予指正。我的CI版本是2.1.3 csdn好像不能上傳文件，我就講代碼放在筆記下面了。如果覺得能對您有一些可以經常來看，我會不定期更新。知道讀完CI源碼程序入口： 1、? 應用程序環境設置development? testing?production? 可以設置這三種環境 2、? 對不同的環境應用不同的錯誤級別 3、? 設置系統文件夾名 4、? 設置應用程序文件夾名 5、? 設置默認控制器（這里被注釋掉了，如果想設置直接開啟） 6、? 設置自定義配置 7、? 增強system path的可靠性 a)????????設置當前目錄保證正確的請求 b)????????保證目錄后面有/ c)????????判斷當前系統路徑是否存在 8、? 開始設置主路徑常量 SELF ?????????????????? 當前文件的路徑 EXT? ????????????????? 文件擴展名 BASEPATH????????? 系統路徑 FCPATH?????????????? 前端控制器路徑 SYSDIR??????????????? 系統文件夾路徑 APPPATH??????????? 應用程序文件夾路徑 9、調用BASEPATH.'core/CodeIgniter.php'文件進入系統引導程序 ~~~ <?php /* *--------------------------------------------------------------- * APPLICATION ENVIRONMENT *--------------------------------------------------------------- * * You can load different configurations depending on your * current environment. Setting the environment also influences * things like logging and error reporting. * * This can be set to anything, but default usage is: * * development * testing * production * * NOTE: If you change these, also change the error_reporting() code below * */ define('ENVIRONMENT', 'development'); /* *--------------------------------------------------------------- * ERROR REPORTING *--------------------------------------------------------------- * * Different environments will require different levels of error reporting. * By default development will show errors but testing and live will hide them. */ if (defined('ENVIRONMENT')) { switch (ENVIRONMENT) { case 'development': error_reporting(E_ALL); break; case 'testing': case 'production': error_reporting(0); break; default: exit('The application environment is not set correctly.'); } } /* *--------------------------------------------------------------- * SYSTEM FOLDER NAME *--------------------------------------------------------------- * * This variable must contain the name of your "system" folder. * Include the path if the folder is not in the same directory * as this file. * */ $system_path = 'system'; /* *--------------------------------------------------------------- * APPLICATION FOLDER NAME *--------------------------------------------------------------- * * If you want this front controller to use a different "application" * folder then the default one you can set its name here. The folder * can also be renamed or relocated anywhere on your server. If * you do, use a full server path. For more info please see the user guide: * http://codeigniter.com/user_guide/general/managing_apps.html * * NO TRAILING SLASH! * */ $application_folder = 'application'; /* * -------------------------------------------------------------------- * DEFAULT CONTROLLER * -------------------------------------------------------------------- * * Normally you will set your default controller in the routes.php file. * You can, however, force a custom routing by hard-coding a specific * controller class/function here. For most applications, you * WILL NOT set your routing here, but it's an option for those 那些 * special 特殊 instances where you might 可能 want to override the standard 標準 * routing in a specific 明確的 front 前面 controller that shares a common CI installation. * * IMPORTANT: 重要的 If you set the routing here, NO OTHER controller will be * callable. 可贖回的 In essence,本質 this preference 偏好、傾向、優先權 limits 范圍、限制 * your application to ONE specific controller. * Leave 許可、離開、留下 the function name blank空白，消失 if you need * to call functions dynamically 動態的 via 通過 the URI. * * Un-comment the $routing array below 在下面 to use this feature 特色，特寫，起重要作用 * */ // The directory name, relative 相關的 to the "controllers" folder. Leave blank // if your controller is not in a sub-folder 代替-文件夾 within 在。。。之內 // the "controllers" folder // $routing['directory'] = ''; // The controller class file name. Example: Mycontroller // $routing['controller'] = ''; // The controller function you wish 希望 to be called. // $routing['function'] = ''; /* * ------------------------------------------------------------------- * CUSTOM 習慣、定制的、自定義的 CONFIG VALUES * ------------------------------------------------------------------- * * The $assign_to_config array below will be passed 通過 dynamically to the * config class when initialized.初始化 This allows you to set custom config * items or override any default config values found in the config.php file. * This can be handy 方便的 as it permits 許可 you to share one application between * multiple front controller files, with each 每各 file containing 包含 different * config values. * * Un-comment the $assign_to_config array below to use this feature * */ // $assign_to_config['name_of_config_item'] = 'value of config item'; // -------------------------------------------------------------------- // END OF USER CONFIGURABLE 可配置的 SETTINGS. DO NOT EDIT BELOW THIS LINE // end of 最終 user configurable settings . do not edit below this line // -------------------------------------------------------------------- /* * --------------------------------------------------------------- * Resolve 決定 the system path for increased 增強的、增加 reliability 可靠性 * --------------------------------------------------------------- */ // Set the current directory correctly 正確的 for CLI requests 請求 if (defined('STDIN')) { chdir(dirname(__FILE__)); } if (realpath($system_path) !== FALSE) { $system_path = realpath($system_path).'/'; } // ensure 保證 there's a trailing 后面的 slash 斜杠 $system_path = rtrim($system_path, '/').'/'; // Is the system path correct? if ( ! is_dir($system_path)) { exit("Your system folder path does not appear to be set correctly. Please open the following file and correct this: ".pathinfo(__FILE__, PATHINFO_BASENAME)); } /* * ------------------------------------------------------------------- * Now that we know the path, set the main path constants 常量 * ------------------------------------------------------------------- */ // The name of THIS file define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME)); // The PHP file extension 擴展 // this global constant is deprecated.不贊成棄用 define('EXT', '.php'); // Path to the system folder define('BASEPATH', str_replace("\\", "/", $system_path)); // Path to the front controller （front controller）前端控制器 (this file) define('FCPATH', str_replace(SELF, '', __FILE__)); // Name of the "system folder" define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/')); // The path to the "application" folder if (is_dir($application_folder)) { define('APPPATH', $application_folder.'/'); } else { if ( ! is_dir(BASEPATH.$application_folder.'/')) { exit("Your application folder path does not appear to be set correctly. Please open the following file and correct this: ".SELF); } define('APPPATH', BASEPATH.$application_folder.'/'); } /* * -------------------------------------------------------------------- * LOAD THE BOOTSTRAP 引導程序 FILE * -------------------------------------------------------------------- * * And away we go... 和我們走 * */ require_once BASEPATH.'core/CodeIgniter.php'; /* End of file index.php */ /* Location: ./index.php */ ~~~