php 替换敏感字符串的类(附源码)

2. /** string filter class
3. * Date: 2013-01-09
4. * Author: fdipzone
5. * Ver: v1.0
6. * Edit: bbs.it-home.org
7. * Func:
8. * public replace 替换非法字符
9. * public check 检查是否含有非法字符
10. * private protect_white_list 保护白名单
11. * private resume_white_list 还原白名单
12. * private getval 白名单 key转为value
13. */
14. class StrFilter{ // class start
16. private $_white_list = array();
17. private $_black_list = array();
18. private $_replacement = '*';
19. private $_LTAG = '[[##';
20. private $_RTAG = '##]]';
22. /**
23. * @param Array $white_list
24. * @param Array $black_list
25. * @param String $replacement
26. */
27. public function __construct($white_list=array(), $black_list=array(), $replacement='*'){
28. $this->_white_list = $white_list;
29. $this->_black_list = $black_list;
30. $this->_replacement = $replacement;
31. }
33. /** 替换非法字符
34. * @param String $content 要替換的字符串
35. * @return String 替換后的字符串
36. */
37. public function replace($content){
39. if(!isset($content) || $content==''){
40. return '';
41. }
43. // protect white list
44. $content = $this->protect_white_list($content);
46. // replace black list
47. if($this->_black_list){
48. foreach($this->_black_list as $val){
49. $content = str_replace($val, $this->_replacement, $content);
50. }
51. }
53. // resume white list
54. $content = $this->resume_white_list($content);
56. return $content;
57. }
59. /** 检查是否含有非法自符
60. * @param String $content 字符串
61. * @return boolean
62. */
63. public function check($content){
65. if(!isset($content) || $content==''){
66. return true;
67. }
69. // protect white list
70. $content = $this->protect_white_list($content);
72. // check
73. if($this->_black_list){
74. foreach($this->_black_list as $val){
75. if(strstr($content, $val)!=''){
76. return false;
77. }
78. }
79. }
80. return true;
81. }
83. /** 保护白名单
84. * @param String $content 字符串
85. * @return String
86. */
87. private function protect_white_list($content){
88. if($this->_white_list){
89. foreach($this->_white_list as $key=>$val){
90. $content = str_replace($val, $this->_LTAG.$key.$this->_RTAG, $content);
91. }
92. }
93. return $content;
94. }
96. /** 还原白名单
97. * @param String $content
98. * @return String
99. */
100. private function resume_white_list($content){
101. if($this->_white_list){
102. $content = preg_replace_callback("/\[\[##(.*?)##\]\].*?/si", array($this, 'getval'), $content);
103. }
104. return $content;
105. }
106. /** 白名单 key还原为value
107. * @param Array $matches 匹配white_list的key
108. * @return String white_list val
109. */
110. private function getval($matches){
111. return isset($this->_white_list[$matches[1]])? $this->_white_list[$matches[1]] : ''; // key->val
112. }
114. } // class end
116. ?>

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2，演示示例 demo.php

2. header("content-type:text/html;charset=utf8");
4. require("StrFilter.class.php");
6. $white = array('屌丝', '曹操');
7. $black = array('屌', '操');
9. $content = "我操,曹操你是屌丝,我屌你啊";
11. $obj = new StrFilter($white, $black);
12. echo $obj->replace($content);
13. ?>

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附，php 替换敏感字符串的类源码下载地址。