CodeIgniter源代码阅读（一）index.php
1 <?php
2
3 /*
4 *---------------------------------------------------------------
5 * APPLICATION ENVIRONMENT
6 *---------------------------------------------------------------
7 *
8 * You can load different configurations depending on your
9 * current environment. Setting the environment also influences
10 * things like logging and error reporting.
11 *
12 * This can be set to anything, but default usage is:
13 *
14 * development
15 * testing
16 * production
17 *
18 * NOTE: If you change these, also change the error_reporting() code below
19 *
20 */
21 define('ENVIRONMENT', 'development');//开发环境
22 /*
23 *---------------------------------------------------------------
24 * ERROR REPORTING
25 *---------------------------------------------------------------
26 *
27 * Different environments will require different levels of error reporting.
28 * By default development will show errors but testing and live will hide them.
29 */
30 //不同环境的 错误提示级别
31 if (defined('ENVIRONMENT'))
32 {
33 switch (ENVIRONMENT)
34 {
35 case 'development':
36 error_reporting(E_ALL);
37 break;
38
39 case 'testing':
40 case 'production':
41 error_reporting(0);
42 break;
43
44 default:
45 exit('The application environment is not set correctly.');
46 }
47 }
48
49 /*
50 *---------------------------------------------------------------
51 * SYSTEM FOLDER NAME
52 *---------------------------------------------------------------
53 *
54 * This variable must contain the name of your "system" folder.
55 * Include the path if the folder is not in the same directory
56 * as this file.
57 * 系统目录
58 */
59 $system_path = 'system';
60
61 /*
62 *---------------------------------------------------------------
63 * APPLICATION FOLDER NAME
64 *---------------------------------------------------------------
65 *
66 * If you want this front controller to use a different "application"
67 * folder then the default one you can set its name here. The folder
68 * can also be renamed or relocated anywhere on your server. If
69 * you do, use a full server path. For more info please see the user guide:
70 * http://codeigniter.com/user_guide/general/managing_apps.html
71 *
72 * NO TRAILING SLASH!
73 *应用目录
74 */
75 $application_folder = 'application';//应用程序目录
76
77 /*
78 * --------------------------------------------------------------------
79 * DEFAULT CONTROLLER
80 * --------------------------------------------------------------------
81 *
82 * Normally you will set your default controller in the routes.php file.
83 * You can, however, force a custom routing by hard-coding a
84 * specific controller class/function here. For most applications, you
85 * WILL NOT set your routing here, but it's an option for those
86 * special instances where you might want to override the standard
87 * routing in a specific front controller that shares a common CI installation.
88 *
89 * IMPORTANT: If you set the routing here, NO OTHER controller will be
90 * callable. In essence, this preference limits your application to ONE
91 * specific controller. Leave the function name blank if you need
92 * to call functions dynamically via the URI.
93 *
94 * Un-comment the $routing array below to use this feature
95 *
96 */
97 // The directory name, relative to the "controllers" folder. Leave blank
98 // if your controller is not in a sub-folder within the "controllers" folder
99 // $routing['directory'] = '';
100
101 // The controller class file name. Example: Mycontroller
102 // $routing['controller'] = '';
103
104 // The controller function you wish to be called.
105 // $routing['function'] = '';
106
107
108 /*
109 * -------------------------------------------------------------------
110 * CUSTOM CONFIG VALUES
111 * -------------------------------------------------------------------
112 *
113 * The $assign_to_config array below will be passed dynamically to the
114 * config class when initialized. This allows you to set custom config
115 * items or override any default config values found in the config.php file.
116 * This can be handy as it permits you to share one application between
117 * multiple front controller files, with each file containing different
118 * config values.
119 *
120 * Un-comment the $assign_to_config array below to use this feature
121 *
122 */
123 // $assign_to_config['name_of_config_item'] = 'value of config item';
124
125
126
127 // --------------------------------------------------------------------
128 // END OF USER CONFIGURABLE SETTINGS. DO NOT EDIT BELOW THIS LINE
129 // --------------------------------------------------------------------
130
131 /*
132 * ---------------------------------------------------------------
133 * Resolve the system path for increased reliability
134 * ---------------------------------------------------------------
135 */
136
137 // Set the current directory correctly for CLI requests CLI，命令行界面
138 if (defined('STDIN'))
139 {
140 chdir(dirname(__FILE__));
141 }
142 //$system_path,即核心文件所在的路径。realpath($path)中的$path必须为存在的路径
143 if (realpath($system_path) !== FALSE)//realpath返回规范化的绝对路径名
144
145 {
146 $system_path = realpath($system_path).'/';
147 }
148
149 // ensure there's a trailing slash 确保最后有个斜线
150 $system_path = rtrim($system_path, '/').'/';
151
152 // Is the system path correct?
153 if ( ! is_dir($system_path))
154 {
155 exit("Your system folder path does not appear to be set correctly. Please open the following file and correct this: ".pathinfo(__FILE__, PATHINFO_BASENAME));
156 }
157
158 /*
159 * -------------------------------------------------------------------
160 * Now that we know the path, set the main path constants
161 * -------------------------------------------------------------------
162 */
163 // 这个入口文件的文件名，目前是index.php
164 // The name of THIS file
165 define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));//index.php
166
167 // The PHP file extension
168 // this global constant is deprecated.
169 define('EXT', '.php');
170
171 // Path to the system folder// 统一以/为目录分隔符（windows下是/或\，linux下默认是/）
172 define('BASEPATH', str_replace("\\", "/", $system_path));//F:/products/zh.ci/system/
173
174 // Path to the front controller (this file)
175 define('FCPATH', str_replace(SELF, '', __FILE__));//F:\products\zh.ci\
176
177 // Name of the "system folder"核心文件的目录名
178 define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/'));//strrchr — 查找指定字符在字符串中的最后一次出现 system
179
180 // The path to the "application" folder
181 if (is_dir($application_folder))//如果文件名存在并且为目录则返回 TRUE。如果 filename 是一个相对路径，则按照当前工作目录检查其相对路径。
182 {
183 define('APPPATH', $application_folder.'/');
184 }
185 else
186 {
187 if ( ! is_dir(BASEPATH.$application_folder.'/'))
188 {
189 exit("Your application folder path does not appear to be set correctly. Please open the following file and correct this: ".SELF);
190 }
191
192 define('APPPATH', BASEPATH.$application_folder.'/');
193 }
194 /*
195 * --------------------------------------------------------------------
196 * LOAD THE BOOTSTRAP FILE
197 * --------------------------------------------------------------------
198 *
199 * And away we go...
200 *
201 */
202 //echo BASEPATH;
203 require_once BASEPATH.'core/CodeIgniter.php';
204
205 /* End of file index.php */
206 /* Location: ./index.php */
2
3 /*
4 *---------------------------------------------------------------
5 * APPLICATION ENVIRONMENT
6 *---------------------------------------------------------------
7 *
8 * You can load different configurations depending on your
9 * current environment. Setting the environment also influences
10 * things like logging and error reporting.
11 *
12 * This can be set to anything, but default usage is:
13 *
14 * development
15 * testing
16 * production
17 *
18 * NOTE: If you change these, also change the error_reporting() code below
19 *
20 */
21 define('ENVIRONMENT', 'development');//开发环境
22 /*
23 *---------------------------------------------------------------
24 * ERROR REPORTING
25 *---------------------------------------------------------------
26 *
27 * Different environments will require different levels of error reporting.
28 * By default development will show errors but testing and live will hide them.
29 */
30 //不同环境的 错误提示级别
31 if (defined('ENVIRONMENT'))
32 {
33 switch (ENVIRONMENT)
34 {
35 case 'development':
36 error_reporting(E_ALL);
37 break;
38
39 case 'testing':
40 case 'production':
41 error_reporting(0);
42 break;
43
44 default:
45 exit('The application environment is not set correctly.');
46 }
47 }
48
49 /*
50 *---------------------------------------------------------------
51 * SYSTEM FOLDER NAME
52 *---------------------------------------------------------------
53 *
54 * This variable must contain the name of your "system" folder.
55 * Include the path if the folder is not in the same directory
56 * as this file.
57 * 系统目录
58 */
59 $system_path = 'system';
60
61 /*
62 *---------------------------------------------------------------
63 * APPLICATION FOLDER NAME
64 *---------------------------------------------------------------
65 *
66 * If you want this front controller to use a different "application"
67 * folder then the default one you can set its name here. The folder
68 * can also be renamed or relocated anywhere on your server. If
69 * you do, use a full server path. For more info please see the user guide:
70 * http://codeigniter.com/user_guide/general/managing_apps.html
71 *
72 * NO TRAILING SLASH!
73 *应用目录
74 */
75 $application_folder = 'application';//应用程序目录
76
77 /*
78 * --------------------------------------------------------------------
79 * DEFAULT CONTROLLER
80 * --------------------------------------------------------------------
81 *
82 * Normally you will set your default controller in the routes.php file.
83 * You can, however, force a custom routing by hard-coding a
84 * specific controller class/function here. For most applications, you
85 * WILL NOT set your routing here, but it's an option for those
86 * special instances where you might want to override the standard
87 * routing in a specific front controller that shares a common CI installation.
88 *
89 * IMPORTANT: If you set the routing here, NO OTHER controller will be
90 * callable. In essence, this preference limits your application to ONE
91 * specific controller. Leave the function name blank if you need
92 * to call functions dynamically via the URI.
93 *
94 * Un-comment the $routing array below to use this feature
95 *
96 */
97 // The directory name, relative to the "controllers" folder. Leave blank
98 // if your controller is not in a sub-folder within the "controllers" folder
99 // $routing['directory'] = '';
100
101 // The controller class file name. Example: Mycontroller
102 // $routing['controller'] = '';
103
104 // The controller function you wish to be called.
105 // $routing['function'] = '';
106
107
108 /*
109 * -------------------------------------------------------------------
110 * CUSTOM CONFIG VALUES
111 * -------------------------------------------------------------------
112 *
113 * The $assign_to_config array below will be passed dynamically to the
114 * config class when initialized. This allows you to set custom config
115 * items or override any default config values found in the config.php file.
116 * This can be handy as it permits you to share one application between
117 * multiple front controller files, with each file containing different
118 * config values.
119 *
120 * Un-comment the $assign_to_config array below to use this feature
121 *
122 */
123 // $assign_to_config['name_of_config_item'] = 'value of config item';
124
125
126
127 // --------------------------------------------------------------------
128 // END OF USER CONFIGURABLE SETTINGS. DO NOT EDIT BELOW THIS LINE
129 // --------------------------------------------------------------------
130
131 /*
132 * ---------------------------------------------------------------
133 * Resolve the system path for increased reliability
134 * ---------------------------------------------------------------
135 */
136
137 // Set the current directory correctly for CLI requests CLI，命令行界面
138 if (defined('STDIN'))
139 {
140 chdir(dirname(__FILE__));
141 }
142 //$system_path,即核心文件所在的路径。realpath($path)中的$path必须为存在的路径
143 if (realpath($system_path) !== FALSE)//realpath返回规范化的绝对路径名
144
145 {
146 $system_path = realpath($system_path).'/';
147 }
148
149 // ensure there's a trailing slash 确保最后有个斜线
150 $system_path = rtrim($system_path, '/').'/';
151
152 // Is the system path correct?
153 if ( ! is_dir($system_path))
154 {
155 exit("Your system folder path does not appear to be set correctly. Please open the following file and correct this: ".pathinfo(__FILE__, PATHINFO_BASENAME));
156 }
157
158 /*
159 * -------------------------------------------------------------------
160 * Now that we know the path, set the main path constants
161 * -------------------------------------------------------------------
162 */
163 // 这个入口文件的文件名，目前是index.php
164 // The name of THIS file
165 define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));//index.php
166
167 // The PHP file extension
168 // this global constant is deprecated.
169 define('EXT', '.php');
170
171 // Path to the system folder// 统一以/为目录分隔符（windows下是/或\，linux下默认是/）
172 define('BASEPATH', str_replace("\\", "/", $system_path));//F:/products/zh.ci/system/
173
174 // Path to the front controller (this file)
175 define('FCPATH', str_replace(SELF, '', __FILE__));//F:\products\zh.ci\
176
177 // Name of the "system folder"核心文件的目录名
178 define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/'));//strrchr — 查找指定字符在字符串中的最后一次出现 system
179
180 // The path to the "application" folder
181 if (is_dir($application_folder))//如果文件名存在并且为目录则返回 TRUE。如果 filename 是一个相对路径，则按照当前工作目录检查其相对路径。
182 {
183 define('APPPATH', $application_folder.'/');
184 }
185 else
186 {
187 if ( ! is_dir(BASEPATH.$application_folder.'/'))
188 {
189 exit("Your application folder path does not appear to be set correctly. Please open the following file and correct this: ".SELF);
190 }
191
192 define('APPPATH', BASEPATH.$application_folder.'/');
193 }
194 /*
195 * --------------------------------------------------------------------
196 * LOAD THE BOOTSTRAP FILE
197 * --------------------------------------------------------------------
198 *
199 * And away we go...
200 *
201 */
202 //echo BASEPATH;
203 require_once BASEPATH.'core/CodeIgniter.php';
204
205 /* End of file index.php */
206 /* Location: ./index.php */
