PHP 接受提交变量过滤类

  1 <?php
  2 class Filter{
  3 
  4     /**
  5      * 将\n转化为<br/>
  6      *
  7      * @param string $string 待转换的字符串
  8      * @return string
  9      */
 10     static public function nl2br($string){
 11         return nl2br($string);
 12     }
 13 
 14     /**
 15      * 将<br/>转化为\n
 16      *
 17      * @param string $string 待转换的字符串
 18      * @return string
 19      */
 20     static public function br2nl($string){
 21         $array = array('<br>', '<br/>');
 22         return str_replace($array, "\n", $string);
 23     }
 24 
 25     /**
 26      * 多个连续空格只保留一个
 27      * @param $string 待转换的字符串
 28      * @return mixed
 29      */
 30     static public function mergeSpaces($string){
 31         return preg_replace("/\s(?=\s)/","\\1", $string);
 32     }
 33 
 34     /**
 35      * 过滤字符串中开头和结尾的特定字符
 36      * @param string $string        待转换的字符串
 37      * @param string $char_list     要转换的特定字符列表
 38      * @return string
 39      */
 40     static public function trim($string, $char_list='\\\\s'){
 41 
 42         $chars = preg_replace(
 43             array( '/[\^\-\]\\\]/S', '/\\\{4}/S', '/\//'),
 44             array( '\\\\\\0', '\\', '\/' ),
 45             $char_list);
 46         $pattern = '^[' . $chars . ']*|[' . $chars . ']*';
 47 
 48         return preg_replace("/$pattern/sSD", '', $string);
 49     }
 50 
 51     /**
 52     * 过滤特殊字符
 53     *
 54     *    @param string  $string    待转换的字符串
 55     *    @return string
 56     */
 57     static public function filterSpecial($string)
 58     {
 59         $search = array (
 60              "'<script[^>]*?>.*?</script>'si",    // 去掉 javascript
 61              "'([\r\n\s])'",                           // 去掉空白字符
 62              "'(\')'"                                  // 替换英文'为中文’
 63         );
 64   
 65         $replace = array ("","","’",);
 66     
 67         return preg_replace ($search, $replace, $string);
 68     }
 69     
 70     /**
 71     * 过滤HTML标记
 72     *
 73     *    @param string $string    需过滤内容
 74     *    @return string
 75     */
 76     static public function filterHtml($string)
 77     {
 78         $search = array (
 79            "'<script[^>]*?>.*?</script>'si",    // 去掉 javascript
 80            "'<[\/\!]*?[^<>]*?>'si",             // 去掉 HTML 标记
 81            "'([\r\n\s])'" ,                     // 去掉空白字符
 82            "'(\')'"                             // 替换英文'为中文’
 83         );
 84 
 85         $replace = array ("","","","’");
 86 
 87         return preg_replace ($search, $replace, $string);
 88     }
 89 
 90     /**
 91      * 过滤字符串
 92      * @param string $string 待转换的字符串
 93      * @return string
 94      */
 95     static public function filterString($string)
 96     {
 97         
 98         $search = array (
 99             "'<script[^>]*?>.*?</script>'si",
100             "'<[\/\!]*?[^<>]*?>'si",
101             "'[\r\n]|[\s]+'",
102             "'&(lt|#60);'i",
103             "'\''",
104             "'&(gt|#62);'i",
105             "'[<]|[>]'",
106             "'delete'i",
107             "'update'i",
108             "'sele'i",
109             "'insert'i",
110             "'into'i",
111             "'where'i",
112             "'set'i",
113             "'from'i",
114             "'script'i",
115             "'value'i",
116             "'exe'i",
117             "'localgroup'i",
118             "'chr'i",
119             "'truncate'i",
120             "'sysobjects'i",
121             "'syscolumns'i",
122             "'master'i",
123             "'/add'i",
124             "'cmdshell'i",
125             "'drop'i",
126             "'\\\'");
127      
128         $replace = array("");
129      
130         return preg_replace($search, $replace,$string);
131     }
132     
133     static public function filterContent($string)
134     {
135         $search = array ("'<script[^>]*?>.*?</script>'si",    // 去掉 javascript
136                     "'\''", 
137                     "'&(lt|#60);'i",
138                     "'&(gt|#62);'i",
139                     "'delete'i",
140                     "'update'i",
141                     "'into'i",
142                     "'where'i",
143                     "'set'i",
144                     "'sele'i",
145                     "'insert'i",
146                     "'from'i",
147                     "'value'i",
148                     "'exe'i",
149                     "'localgroup'i",
150                     "'chr'i",
151                     "'truncate'i",
152                     "'sysobjects'i",
153                     "'syscolumns'i",
154                     "'master'i",
155                     "'/add'i",
156                     "'cmdshell'i",
157                     "'drop'i",
158                     "'\\\'");
159      
160         $replace = array ("");
161      
162         return preg_replace($search, $replace, $string);
163     }
164 
165     static public function filterEditor($string){
166 
167         $search = array (
168             "'<[\/\!]*?span[^<>]*?>'si",        // 去掉 span
169             "'<[\/\!]*?div[^<>]*?>'si",         // 去掉 div
170         );
171 
172         $replace = array ("");
173 
174         return preg_replace($search, $replace, $string);
175     }
176 }
177 ?>