这里我们来提取一些可以利用的wordpress函数：
1. is_serialized 检查是否是一个序列化数据
2. is_serialized_string 检查是否是一个字符串序列化数据
3. get_status_header_desc http状态转换成说明
4. nocache_headers 发送一个让页面不缓存的http头信息
5. cache_javascript_headers 让javascript缓存10天的http头信息
6. wp_mkdir_p 递归创建一个完整的目录(整个目录中的子目录不存在都创建)
7. path_is_absolute 检查是否是个绝对路径 (’/foo/bar’, ‘c:\windows’).
8. wp_ext2type 根据扩展名获得文件类型
9. absint 转换成正整数
函数文件在wp程序目录的wp-includes/functions.php
1. /**
2. * 检查是否是一个序列化数据.
3. *
4. * If $data is not an string, then returned value will always be false.
5. * Serialized data is always a string.
6. *
7. * @since 2.0.5
8. *
9. * @param mixed $data Value to check to see if was serialized.
10. * @return bool False if not serialized and true if it was.
11. */
12. function is_serialized( $data ) {
13. // if it isn't a string, it isn't serialized
14. if ( !is_string( $data ) )
15. return false;
16. $data = trim( $data );
17. if ( 'N;' == $data )
18. return true;
19. if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
20. return false;
21. switch ( $badions[1] ) {
22. case 'a' :
23. case 'O' :
24. case 's' :
25. if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
26. return true;
27. break;
28. case 'b' :
29. case 'i' :
30. case 'd' :
31. if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
32. return true;
33. break;
34. }
35. return false;
36. }
37.
38. /**
39. * 检查是否是一个字符串序列化数据
40. *
41. * @since 2.0.5
42. *
43. * @param mixed $data Serialized data
44. * @return bool False if not a serialized string, true if it is.
45. */
46. function is_serialized_string( $data ) {
47. // if it isn't a string, it isn't a serialized string
48. if ( !is_string( $data ) )
49. return false;
50. $data = trim( $data );
51. if ( preg_match( '/^s:[0-9]+:.*;$/s', $data ) ) // this should fetch all serialized strings
52. return true;
53. return false;
54. }
55.
56. /**
57. * http状态转换成说明
58. *
59. * @since 2.3.0
60. *
61. * @param int $code HTTP status code.
62. * @return string Empty string if not found, or description if found.
63. */
64. function get_status_header_desc( $code ) {
65. global $wp_header_to_desc;
66.
67. $code = absint( $code );
68.
69. if ( !isset( $wp_header_to_desc ) ) {
70. $wp_header_to_desc = array(
71. 100 => 'Continue',
72. 101 => 'Switching Protocols',
73.
74. 200 => 'OK',
75. 201 => 'Created',
76. 202 => 'Accepted',
77. 203 => 'Non-Authoritative Information',
78. 204 => 'No Content',
79. 205 => 'Reset Content',
80. 206 => 'Partial Content',
81.
82. 300 => 'Multiple Choices',
83. 301 => 'Moved Permanently',
84. 302 => 'Found',
85. 303 => 'See Other',
86. 304 => 'Not Modified',
87. 305 => 'Use Proxy',
88. 307 => 'Temporary Redirect',
89.
90. 400 => 'Bad Request',
91. 401 => 'Unauthorized',
92. 403 => 'Forbidden',
93. 404 => 'Not Found',
94. 405 => 'Method Not Allowed',
95. 406 => 'Not Acceptable',
96. 407 => 'Proxy Authentication Required',
97. 408 => 'Request Timeout',
98. 409 => 'Conflict',
99. 410 => 'Gone',
100. 411 => 'Length Required',
101. 412 => 'Precondition Failed',
102. 413 => 'Request Entity Too Large',
103. 414 => 'Request-URI Too Long',
104. 415 => 'Unsupported Media Type',
105. 416 => 'Requested Range Not Satisfiable',
106. 417 => 'Expectation Failed',
107.
108. 500 => 'Internal Server Error',
109. 501 => 'Not Implemented',
110. 502 => 'Bad Gateway',
111. 503 => 'Service Unavailable',
112. 504 => 'Gateway Timeout',
113. 505 => 'HTTP Version Not Supported'
114. );
115. }
116.
117. if ( isset( $wp_header_to_desc[$code] ) )
118. return $wp_header_to_desc[$code];
119. else
120. return '';
121. }
122.
123. /**
124. * 发送一个让页面不缓存的http头信息
125. *
126. * Different browsers support different nocache headers, so several headers must
127. * be sent so that all of them get the point that no caching should occur.
128. *
129. * @since 2.0.0
130. */
131. function nocache_headers() {
132. // why are these @-silenced when other header calls aren't?
133. @header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
134. @header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
135. @header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
136. @header( 'Pragma: no-cache' );
137. }
138.
139. /**
140. * 让javascript缓存10天的http头信息
141. *
142. * @since 2.1.0
143. */
144. function cache_javascript_headers() {
145. $expiresOffset = 864000; // 10 days
146. header( "Content-Type: text/javascript; charset=" . get_bloginfo( 'charset' ) );
147. header( "Vary: Accept-Encoding" ); // Handle proxies
148. header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $expiresOffset ) . " GMT" );
149. }
150.
151. /**
152. * 递归创建一个完整的目录(整个目录中的子目录不存在都创建)
153. *
154. * Will attempt to set permissions on folders.
155. *
156. * @since 2.0.1
157. *
158. * @param string $target Full path to attempt to create.
159. * @return bool Whether the path was created or not. True if path already exists.
160. */
161. function wp_mkdir_p( $target ) {
162. // from php.net/mkdir user contributed notes
163. $target = str_replace( '//', '/', $target );
164. if ( file_exists( $target ) )
165. return @is_dir( $target );
166.
167. // Attempting to create the directory may clutter up our display.
168. if ( @mkdir( $target ) ) {
169. $stat = @stat( dirname( $target ) );
170. $dir_perms = $stat['mode'] & 0007777; // Get the permission bits.
171. @chmod( $target, $dir_perms );
172. return true;
173. } elseif ( is_dir( dirname( $target ) ) ) {
174. return false;
175. }
176.
177. // If the above failed, attempt to create the parent node, then try again.
178. if ( ( $target != '/' ) && ( wp_mkdir_p( dirname( $target ) ) ) )
179. return wp_mkdir_p( $target );
180.
181. return false;
182. }
183.
184. /**
185. * 检查是否是个绝对路径 ('/foo/bar', 'c:\windows').
186. *
187. * @since 2.5.0
188. *
189. * @param string $path File path
190. * @return bool True if path is absolute, false is not absolute.
191. */
192. function path_is_absolute( $path ) {
193. // this is definitive if true but fails if $path does not exist or contains a symbolic link
194. if ( realpath($path) == $path )
195. return true;
196.
197. if ( strlen($path) == 0 || $path{0} == '.' )
198. return false;
199.
200. // windows allows absolute paths like this
201. if ( preg_match('#^[a-zA-Z]:\\\\#', $path) )
202. return true;
203.
204. // a path starting with / or \ is absolute; anything else is relative
205. return (bool) preg_match('#^[/\\\\]#', $path);
206. }
207.
208. /**
209. * 根据扩展名获得文件类型
210. *
211. * @package WordPress
212. * @since 2.5.0
213. * @uses apply_filters() Calls 'ext2type' hook on default supported types.
214. *
215. * @param string $ext The extension to search.
216. * @return string|null The file type, example: audio, video, document, spreadsheet, etc. Null if not found.
217. */
218. function wp_ext2type( $ext ) {
219. $ext2type = apply_filters('ext2type', array(
220. 'audio' => array('aac','ac3','aif','aiff','mp1','mp2','mp3','m3a','m4a','m4b','ogg','ram','wav','wma'),
221. 'video' => array('asf','avi','divx','dv','mov','mpg','mpeg','mp4','mpv','ogm','qt','rm','vob','wmv'),
222. 'document' => array('doc','docx','pages','odt','rtf','pdf'),
223. 'spreadsheet' => array('xls','xlsx','numbers','ods'),
224. 'interactive' => array('ppt','pptx','key','odp','swf'),
225. 'text' => array('txt'),
226. 'archive' => array('tar','bz2','gz','cab','dmg','rar','sea','sit','sqx','zip'),
227. 'code' => array('css','html','php','js'),
228. ));
229. foreach ( $ext2type as $type => $exts )
230. if ( in_array($ext, $exts) )
231. return $type;
232. }
233.
234. /**
235. * 转换成正整数
236. *
237. * @since 2.5.0
238. *
239. * @param mixed $maybeint Data you wish to have convered to an absolute integer
240. * @return int An absolute integer
241. */
242. function absint( $maybeint ) {
243. return abs( intval( $maybeint ) );
244. }