下载了WP的代码，并且应用到了网站上面，现在也在正常的运行中，地址是：www.freealgorithm.tk 。具体的申请过程就不赘述了，学习WP的代码。
他的目录结构就不看了，可以下载同名文件我会通过相对目录来区分。
进入网站的第一个默认的页面：/index.php
<?php /** * Front to the WordPress application. This file doesn‘t do anything, but loads * wp-blog-header.php which does and tells WordPress to load the theme. * * @package WordPress */ /** * Tells WordPress to load the WordPress theme and output it. * * @var bool */ define(‘WP_USE_THEMES‘, true); /** Loads the WordPress Environment and Template */ #定义WP_USE_THEMES为true require( dirname( __FILE__ ) . ‘/wp-blog-header.php‘ ); #返回路径中目录部分并且连接字符串得到此php文件的位置，用这个文件代替这个位置 #引入同目录下的wp-blog-header.php文件
知识点：define函数，bool define ( string $name , mixed $value [, bool $case_insensitive = false ] ) 成功返回true否则false。
name：常量的名字。value：常量的值；仅允许标量和 null。标量的类型是 integer，float，string 或者 boolean。 也能够定义常量值的类型为 resource ，但并不推荐这么做，可能会导致未知状况的发生。
require函数替换参数指向的文件，__FILE__取得当前文件的绝对路径，dirname返回路径中的目录部分。比如这个文件返回的就是根目录/。‘.‘这个符号是字符串连接运算符，将dirname(__FILE__)返回的字符串与‘/wp-blog-header.php‘相连接然后require进去。
而/wp-blog-header.php这个文件被包含了，如下：
1 <?php
2
3 /**
4 * Loads the WordPress environment and template.
5 载入WordPress的环境和模板*
6 * @package WordPress
7 */
8
9
10 if ( !isset($wp_did_header) ) #变量是否定义，定义返回true
11 {
12
13 $wp_did_header = true;
14
15
16 require_once( dirname(__FILE__) . ‘/wp-load.php‘ );
17
18 #用wp-load.php代替此语句
19 /*如果定义了就不继续执行，否则执行下面的语句 */
20
21 wp();
22
23
24 require_once( ABSPATH . WPINC . ‘/template-loader.php‘ );
25
26 #同样用
27 }
isset函数用来判断这个变量是否已经被定义了，如果定义了就返回true否则返回false。如果没有定义的话就执行下面的语句，$wp_did_header=true;是定义变量，他是一个布尔变量。然后require_once这个文件 ,require_once函数与require的区别是以后再这个文件里不能再包含这个文件了，即仅仅包含这个文件一次。这些的动作是定义一个布尔变量且包含一个文件。下面的wp();函数指行，现在不知道这个函数的作用，一会就会看到。然后继续包含ABSPATH.WPINC.‘/template-loader.php‘。这个文件了。ABSPATH是绝对路径的意思，这个是WP自定义的常量，还有WPINC这两个，现在我们也不知道它的值是什么。此文件到此没有结束，我们继续跟踪进入wp-load.php.
1 <?php
2
3 /**
4
5 * Bootstrap file for setting the ABSPATH constant
6 * and loading the wp-config.php file. The wp-config.php
7 * file will then load the wp-settings.php file, which
8 * will then set up the WordPress environment.
9 *
10 * If the wp-config.php file is not found then an error
11 * will be displayed asking the visitor to set up the
12 * wp-config.php file.
13 *
14 * Will also search for wp-config.php in WordPress‘ parent
15 * directory to allow the WordPress directory to remain
16 * untouched.
17 *
18 * @internal This file must be parsable by PHP4.
19 *
20 * @package WordPress
21 */
22
23
24 /** Define ABSPATH as this file‘s directory
25 */
26
27 define( ‘ABSPATH‘, dirname(__FILE__) . ‘/‘ );
28
29
30 error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
31
32 /*error_reporting() 函数能够在运行时设置 error_reporting 指令。 PHP 有诸多错误级别，使用该函数可以设置在脚本运行时的级别。 如果没有设置可选参数 level， error_reporting() 仅会返回当前的错误报告级别。 */
33
34 if ( file_exists( ABSPATH . ‘wp-config.php‘) ) #file_exists — 检查文件或目录是否存在，绝对路径+‘wp-config.php‘检测是否存在，这个文件是设置文件，后来在网站文件上传完成后进行安装时候来创建，所以在没有安装时候是不存在这个文件的。
35 {
36
37 /** The config file resides in ABSPATH */
38
39 require_once( ABSPATH . ‘wp-config.php‘ );
40
41 #如果文件存在，require_once把文件拿来
42 #如果文件不存在，判断绝对路径取
43
44 } elseif ( file_exists( dirname(ABSPATH) . ‘/wp-config.php‘ ) && ! file_exists( dirname(ABSPATH) . ‘/wp-settings.php‘ ) )
45 {
46
47 /** The config file resides one level above ABSPATH but is not part of another install */
48
49 require_once( dirname(ABSPATH) . ‘/wp-config.php‘ );
50
51
52 } else {
53
54 // A config file doesn‘t exist
55
56
57 define( ‘WPINC‘, ‘wp-includes‘ );
58
59 define( ‘WP_CONTENT_DIR‘, ABSPATH . ‘wp-content‘ );
60
61 require_once( ABSPATH . WPINC . ‘/load.php‘ );
62
63 require_once( ABSPATH . WPINC . ‘/version.php‘ );
64
65
66 wp_check_php_mysql_versions();
67
68 wp_load_translations_early();
69
70 // Standardize $_SERVER variables across setups.
71
72 wp_fix_server_vars();
73
74
75 require_once( ABSPATH . WPINC . ‘/functions.php‘ );
76
77
78 $path = wp_guess_url() . ‘/wp-admin/setup-config.php‘;
79
80 // Die with an error message
81
82 $die = __( "There doesn‘t seem to be a <code>wp-config.php</code> file. I need this before we can get started." ) . ‘</p>‘;
83
84 $die .= ‘<p>‘ . __( "Need more help? <a href=‘http://codex.wordpress.org/Editing_wp-config.php‘>We got it</a>." ) . ‘</p>‘;
85
86 $die .= ‘<p>‘ . __( "You can create a <code>wp-config.php</code> file through a web interface, but this doesn‘t work for all server setups. The safest way is to manually create the file." ) . ‘</p>‘;
87 $die .= ‘<p><a href="‘ . $path . ‘" class="button button-large">‘ . __( "Create a Configuration File" ) . ‘</a>‘;
88
89
90 wp_die( $die, __( ‘WordPress › Error‘ ) );
91 }
代码稍长，但是以后的代码会更长。这里看到了他的注释说定义ABSPATH为当前文件的目录，而且看到了这个define语句，知道了ABSPATH是dirname(__FILE__).‘/‘。其实还是这个根目录。error_reporting函数的说明在代码里面注释着意思是定义错误级别，我在书中也没有看到类似的说明这个函数，现在不予理会。
if当前绝对路径下的 /wp-config.php文件存在的话就require这个文件。不存在的话继续判断（/wp-config.php和/wp-settings.php）文件是否不存在，那么判断wp-config.php这个文件的判断是否多余？wp-setting.php这个文件是存在的，而wp-config.php是后来在安装时后生成的，第一次安装使用时候是没有的。否则就定义WPINC为‘wp-includes‘，define( ‘WP_CONTENT_DIR‘, ABSPATH . ‘wp-content‘ );require_once( ABSPATH . WPINC . ‘/load.php‘ );这句是将 /wp-includes/load.php包含进去，require_once( ABSPATH . WPINC . ‘/version.php‘ );这句将/wp-includes/version.php包含进去。先跟踪进去/wp-includes/load.php。
1 <?php
2
3 /**
4 * These functions are needed to load WordPress.
5 *
6 * @internal This file must be parsable by PHP4.
7 *
8 * @package WordPress
9 */
10
11
12 /**
13 * Turn register globals off.
14 *
15 * @access private
16 * @since 2.1.0
17 * @return null Will return null if register_globals PHP directive was disabled
18 */
19
20 function wp_unregister_GLOBALS()
21 {
22
23 if ( !ini_get( ‘register_globals‘ ) )
24
25 return;
26
27
28 if ( isset( $_REQUEST[‘GLOBALS‘] ) )
29
30 die( ‘GLOBALS overwrite attempt detected‘ );
31
32 // Variables that shouldn‘t be unset
33
34 $no_unset = array( ‘GLOBALS‘, ‘_GET‘, ‘_POST‘, ‘_COOKIE‘, ‘_REQUEST‘, ‘_SERVER‘, ‘_ENV‘, ‘_FILES‘, ‘table_prefix‘ );
35
36
37 $input = array_merge( $_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset( $_SESSION ) && is_array( $_SESSION ) ? $_SESSION : array() );
38 foreach ( $input as $k => $v )
39
40 if ( !in_array( $k, $no_unset ) && isset( $GLOBALS[$k] ) )
41 {
42
43 unset( $GLOBALS[$k] );
44
45 }
46
47 }
48
49
50 /**
51 * Fix $_SERVER variables for various setups.
52 *
53 * @access private
54 * @since 3.0.0
55 */
56
57 function wp_fix_server_vars()
58 {
59
60 global $PHP_SELF;
61
62
63 $default_server_values = array(
64
65 ‘SERVER_SOFTWARE‘ => ‘‘,
66
67 ‘REQUEST_URI‘ => ‘‘,
68
69 );
70
71
72 $_SERVER = array_merge( $default_server_values, $_SERVER );
73
74 // Fix for IIS when running with PHP ISAPI
75
76 if ( empty( $_SERVER[‘REQUEST_URI‘] ) || ( php_sapi_name() != ‘cgi-fcgi‘ && preg_match( ‘/^Microsoft-IIS\//‘, $_SERVER[‘SERVER_SOFTWARE‘] ) ) )
77 {
78
79 // IIS Mod-Rewrite
80
81 if ( isset( $_SERVER[‘HTTP_X_ORIGINAL_URL‘] ) )
82 {
83
84 $_SERVER[‘REQUEST_URI‘] = $_SERVER[‘HTTP_X_ORIGINAL_URL‘];
85
86 }
87 // IIS Isapi_Rewrite
88
89 else if ( isset( $_SERVER[‘HTTP_X_REWRITE_URL‘] ) ) {
90
91 $_SERVER[‘REQUEST_URI‘] = $_SERVER[‘HTTP_X_REWRITE_URL‘];
92
93 } else {
94 // Use ORIG_PATH_INFO if there is no PATH_INFO
95
96 if ( !isset( $_SERVER[‘PATH_INFO‘] ) && isset( $_SERVER[‘ORIG_PATH_INFO‘] ) )
97
98 $_SERVER[‘PATH_INFO‘] = $_SERVER[‘ORIG_PATH_INFO‘];
99
100
101 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
102
103 if ( isset( $_SERVER[‘PATH_INFO‘] ) ) {
104
105 if ( $_SERVER[‘PATH_INFO‘] == $_SERVER[‘SCRIPT_NAME‘] )
106
107 $_SERVER[‘REQUEST_URI‘] = $_SERVER[‘PATH_INFO‘];
108
109 else
110
111 $_SERVER[‘REQUEST_URI‘] = $_SERVER[‘SCRIPT_NAME‘] . $_SERVER[‘PATH_INFO‘];
112 }
113
114
115 // Append the query string if it exists and isn‘t null
116
117 if ( ! empty( $_SERVER[‘QUERY_STRING‘] ) ) {
118
119 $_SERVER[‘REQUEST_URI‘] .= ‘?‘ . $_SERVER[‘QUERY_STRING‘];
120
121 }
122
123 }
124
125 }
126
127
128 // Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests
129
130 if ( isset( $_SERVER[‘SCRIPT_FILENAME‘] ) && ( strpos( $_SERVER[‘SCRIPT_FILENAME‘], ‘php.cgi‘ ) == strlen( $_SERVER[‘SCRIPT_FILENAME‘] ) - 7 ) )
131
132 $_SERVER[‘SCRIPT_FILENAME‘] = $_SERVER[‘PATH_TRANSLATED‘];
133
134 // Fix for Dreamhost and other PHP as CGI hosts
135
136 if ( strpos( $_SERVER[‘SCRIPT_NAME‘], ‘php.cgi‘ ) !== false )
137
138 unset( $_SERVER[‘PATH_INFO‘] );
139
140 // Fix empty PHP_SELF
141
142 $PHP_SELF = $_SERVER[‘PHP_SELF‘];
143
144 if ( empty( $PHP_SELF ) )
145
146 $_SERVER[‘PHP_SELF‘] = $PHP_SELF = preg_replace( ‘/(\?.*)?$/‘, ‘‘, $_SERVER["REQUEST_URI"] );
147
148 }
149
150
151 /**
152 * Check for the required PHP version, and the MySQL extension or a database drop-in.
153 *
154 * Dies if requirements are not met.
155 *
156 * @access private
157 * @since 3.0.0
158 */
159
160
161 function wp_check_php_mysql_versions() {
162
163 global $required_php_version, $wp_version;
164
165 $php_version = phpversion();
166
167 if ( version_compare( $required_php_version, $php_version, ‘>‘ ) ) {
168
169 wp_load_translations_early();
170
171 header( ‘Content-Type: text/html; charset=utf-8‘ );
172
173 die( sprintf( __( ‘Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.‘ ), $php_version, $wp_version, $required_php_version ) );
174
175 }
176
177
178 if ( ! extension_loaded( ‘mysql‘ ) && ! extension_loaded( ‘mysqli‘ ) && ! file_exists( WP_CONTENT_DIR . ‘/db.php‘ ) ) {
179
180 wp_load_translations_early();
181
182 header( ‘Content-Type: text/html; charset=utf-8‘ );
183
184 die( __( ‘Your PHP installation appears to be missing the MySQL extension which is required by WordPress.‘ ) );
185
186 }
187
188 }
189
190
191
192 /**
193 * Don‘t load all of WordPress when handling a favicon.ico request.
194 * Instead, send the headers for a zero-length favicon and bail.
195 *
196 * @since 3.0.0
197 */
198
199
200 function wp_favicon_request() {
201
202 if ( ‘/favicon.ico‘ == $_SERVER[‘REQUEST_URI‘] ) {
203
204 header(‘Content-Type: image/vnd.microsoft.icon‘);
205
206 header(‘Content-Length: 0‘);
207
208 exit;
209
210 }
211
212 }
213
214
215 /**
216 * Dies with a maintenance message when conditions are met.
217 *
218 * Checks for a file in the WordPress root directory named ".maintenance".
219 * This file will contain the variable $upgrading, set to the time the file
220 * was created. If the file was created less than 10 minutes ago, WordPress
221 * enters maintenance mode and displays a message.
222 *
223 * The default message can be replaced by using a drop-in (maintenance.php in
224 * the wp-content directory).
225 *
226 * @access private
227 * @since 3.0.0
228 */
229
230
231 function wp_maintenance() {
232
233 if ( !file_exists( ABSPATH . ‘.maintenance‘ ) || defined( ‘WP_INSTALLING‘ ) )
234
235 return;
236
237
238 global $upgrading;
239
240
241 include( ABSPATH . ‘.maintenance‘ );
242
243 // If the $upgrading timestamp is older than 10 minutes, don‘t die.
244
245 if ( ( time() - $upgrading ) >= 600 )
246
247 return;
248
249
250 if ( file_exists( WP_CONTENT_DIR . ‘/maintenance.php‘ ) ) {
251
252 require_once( WP_CONTENT_DIR . ‘/maintenance.php‘ );
253
254 die();
255
256 }
257
258
259 wp_load_translations_early();
260
261
262 $protocol = $_SERVER["SERVER_PROTOCOL"];
263
264 if ( ‘HTTP/1.1‘ != $protocol && ‘HTTP/1.0‘ != $protocol )
265
266 $protocol = ‘HTTP/1.0‘;
267
268 header( "$protocol 503 Service Unavailable", true, 503 );
269
270 header( ‘Content-Type: text/html; charset=utf-8‘ );
271
272 header( ‘Retry-After: 600‘ );
273
274 ?>
这是load.php的php部分，下面就基本是html代码了，html先不予分析。ini_get返回配制选项的值
时间： 2024-12-18 03:13:08