CI Framework Source code entry file index.php that is where the program begins to execute

index.php  in the Extract directory of CI, and the system folder and <?php//definition environment,system_path,application_folder//according to System_path, Application_folder, defining constants basepath,apppath,self, ext, fcpath,sysdir *----------------------------- ---------------------------------- * 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 * */  //ENVIRONMENT  decide whether to error  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 ':    //e_all : All errors are reported    error_reporting (e_all);  break;  case  ' testing ':   case  ' production ':    error_reporting (0);  break;  default:    exit (' The application environment is not set correctly. ');  }}//system the name of the folder, who did not change it ah/* *--------------------------------------------------------------- *  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 ';   //look for the folder in which the controller //  no back slash!! /* *--------------------------------------------------------------- * 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/mysjjy ';   // system/core/router.php /* * ------------------------------------------------------------------- - * 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 * special instances where you  might want to override the standard * routing in a  specific front controller that shares a common ci installation. *  * important:  if you set the routing here, no other  controller will be * callable. In essence, this preference  Limits your application to one * specific controller.  leave  the function namE blank if you need * to call functions dynamically via  the URI. * * Un-comment the  $routing  array below to  Use this feature * */ // the directory name, relative to  the  "Controllers"  folder.  Leave blank // if your  controller is not in a sub-folder within the  "Controllers"  folder  //  $routing [' directory '] =  ';  // the controller class file  name.  Example:  Mycontroller //  $routing [' Controller '] =  ';  // the controller function you wish to be called. // $ routing[' function '] =  ';/* * ------------------------------------------------------------ ------- *  CUSTOM config values * ------------------------------------------------------------------- *  * The  $assign _to_config array below will be passed dynamically  to the * config class when initialized. this allows you  to set custom config * items or override any default  Config values found in the config.php file. * this can be  handy as it permits you to share one application between  * multiple front controller files, with each file containing  different * config values. * * Un-comment the  $assign _to_config  array below to use this feature * */ //  $assign _to_config[' Name_of_config_item '] = ‘ Value of config item ';// ----------------------------------------------------------------- ---// end of user configurable settings.  do not edit below  THIS LINE// --------------------------------------------------------------------/* *  --------------------------------------------------------------- *  Resolve the  system path for increased reliability * ---------------------------------------- ----------------------- */ // set the current directory correctly for  CLI requests if  (Defined (' STDIN '))  {  chdir (DirName (__file__));  }  if  (Realpath ($system _path)  !== false)  {   $system _path = realpath ($system _path). ' /';  } //ensure that the system ends with/ // ensure there ' s a trailing slash  $system _paTh = rtrim ($system _path,  '/'). ' /';  //if System path is not a dir, error!  // 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 * -------------------------------------------- ----------------------- */  //pathinfo  Path Decomposition   //SELF index.php //  The name of this file define (' Self ',  pathinfo (__file__, pathinfo_basename)) ;  //extension  // the php&Nbsp;file extension // this global constant is deprecated. define (' EXT ',  '. php ');  //defines basepath  as system_path // path to the system  Folder define (' BasePath ',  str_replace ("\ \",  "/",  $system _path));  //Remove index.php    Path to the front controller  (this file)  define (' Fcpath ',  str_ Replace (self,  ",  __file__)); // name of the " System folder "  Define (' Sysdir ',  trim (STRRCHR (Trim (basepath,  '/'),  '/'),  '/'));  //defines apppath  as $ Application_folder. ' /'  // The path to the  "Application"  folder //is_dir ($filename)   IF  filename  is a relative path, according to the current working directory to check its relative path  //that is index.php is located in the directory is not Application_folder, look for system under no, Defined as apppath if  (Is_dir ($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 file * ----------------------------------------------------------- --------- * * and away we go... * */ //Reference System/core/ Codeigniter.phprequire_once basepath. ' Core/codeigniter.php ';/* end of file index.php *//* location: ./index.php  */

CI Framework Source code entry file index.php that is where the program begins to execute