search
Homephp教程php手册php过滤html标记属性类用法实例

php过滤html标记属性类用法实例

Jun 13, 2016 am 09:24 AM
htmlphpspecificExampleAttributesmethodmarkusagekindfilter

php过滤html标记属性类用法实例

 具体方法如下:

HtmlAttributeFilter.class.php类文件如下:

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

/** HTML Attribute Filter 

*  Date:  2013-09-22 

*  Author: fdipzone 

*  ver:  1.0 

*  Func: 

*  public strip       过滤属性 

*  public setAllow      设置允许的属性 

*  public setException    设置特例 

*  public setIgnore     设置忽略的标记 

*  private findElements    搜寻需要处理的元素 

*  private findAttributes   搜寻属性 

*  private removeAttributes  移除属性 

*  private isException    判断是否特例 

*  private createAttributes  创建属性 

*  private protect      特殊字符转义 

*/ 

   

class HtmlAttributeFilter{ // class start 

   

  private $_str = '';      // 源字符串 

  private $_allow = array();   // 允许保留的属性 例如:array('id','class','title') 

  private $_exception = array(); // 特例 例如:array('a'=>array('href','class'),'span'=>array('class')) 

  private $_ignore = array();  // 忽略过滤的标记 例如:array('span','img') 

   

   

  /** 处理HTML,过滤不保留的属性 

  * @param String $str 源字符串 

  * @return String 

  */ 

  public function strip($str){ 

    $this->_str = $str; 

   

    if(is_string($this->_str) && strlen($this->_str)>0){ // 判断字符串 

   

      $this->_str = strtolower($this->_str); // 转成小写 

   

      $res = $this->findElements(); 

      if(is_string($res)){ 

        return $res; 

      } 

      $nodes = $this->findAttributes($res); 

      $this->removeAttributes($nodes); 

    } 

    return $this->_str; 

  } 

   

  /** 设置允许的属性 

  * @param Array $param 

  */ 

  public function setAllow($param=array()){ 

    $this->_allow = $param; 

  } 

   

  /** 设置特例 

  * @param Array $param 

  */ 

  public function setException($param=array()){ 

    $this->_exception = $param; 

  } 

   

  /** 设置忽略的标记 

  * @param Array $param 

  */ 

  public function setIgnore($param=array()){ 

    $this->_ignore = $param; 

  } 

   

  /** 搜寻需要处理的元素 */ 

  private function findElements(){ 

    $nodes = array(); 

    preg_match_all("/\n]+)([^>]*)>/i", $this->_str, $elements); 

    foreach($elements[1] as $el_key => $element){ 

      if($elements[2][$el_key]){ 

        $literal = $elements[0][$el_key]; 

        $element_name = $elements[1][$el_key]; 

        $attributes = $elements[2][$el_key]; 

        if(is_array($this->_ignore) && !in_array($element_name, $this->_ignore)){ 

          $nodes[] = array('literal'=>$literal, 'name'=>$element_name, 'attributes'=>$attributes); 

        } 

      } 

    } 

   

    if(!$nodes[0]){ 

      return $this->_str; 

    }else{ 

      return $nodes; 

    } 

  } 

   

  /** 搜寻属性 

  * @param Array $nodes 需要处理的元素 

  */ 

  private function findAttributes($nodes){ 

    foreach($nodes as &$node){ 

      preg_match_all("/([^ =]+)\s*=\s*[\"|']{0,1}([^\"']*)[\"|']{0,1}/i", $node['attributes'], $attributes); 

      if($attributes[1]){ 

        foreach($attributes[1] as $att_key=>$att){ 

          $literal = $attributes[0][$att_key]; 

          $attribute_name = $attributes[1][$att_key]; 

          $value = $attributes[2][$att_key]; 

          $atts[] = array('literal'=>$literal, 'name'=>$attribute_name, 'value'=>$value); 

        } 

      }else{ 

        $node['attributes'] = null; 

      } 

      $node['attributes'] = $atts; 

      unset($atts); 

    } 

    return $nodes; 

  } 

   

  /** 移除属性 

  * @param Array $nodes 需要处理的元素 

  */ 

  private function removeAttributes($nodes){ 

    foreach($nodes as $node){ 

      $node_name = $node['name']; 

      $new_attributes = ''; 

      if(is_array($node['attributes'])){ 

        foreach($node['attributes'] as $attribute){ 

          if((is_array($this->_allow) && in_array($attribute['name'], $this->_allow)) || $this->isException($node_name, $attribute['name'], $this->_exception)){ 

            $new_attributes = $this->createAttributes($new_attributes, $attribute['name'], $attribute['value']); 

          } 

        } 

      } 

      $replacement = ($new_attributes) ? "" : ""; 

      $this->_str = preg_replace('/'.$this->protect($node['literal']).'/', $replacement, $this->_str); 

    } 

  } 

   

  /** 判断是否特例 

  * @param String $element_name  元素名 

  * @param String $attribute_name 属性名 

  * @param Array $exceptions   允许的特例 

  * @return boolean 

  */ 

  private function isException($element_name, $attribute_name, $exceptions){ 

    if(array_key_exists($element_name, $this->_exception)){ 

      if(in_array($attribute_name, $this->_exception[$element_name])){ 

        return true; 

      } 

    } 

    return false; 

  } 

   

  /** 创建属性 

  * @param String $new_attributes 

  * @param String $name 

  * @param String $value 

  * @return String 

  */ 

  private function createAttributes($new_attributes, $name, $value){ 

    if($new_attributes){ 

      $new_attributes .= " "; 

    } 

    $new_attributes .= "$name=\"$value\""; 

    return $new_attributes; 

  } 

   

   

  /** 特殊字符转义 

  * @param String $str 源字符串 

  * @return String 

  */ 

  private function protect($str){ 

    $conversions = array( 

      "^" => "\^",  

      "[" => "\[",  

      "." => "\.",  

      "$" => "\$",  

      "{" => "\{",  

      "*" => "\*",  

      "(" => "\(",  

      "\\" => "\\\\",  

      "/" => "\/",  

      "+" => "\+",  

      ")" => "\)",  

      "|" => "\|",  

      "?" => "\?",  

      " "\

      ">" => "\>"  

    ); 

    return strtr($str, $conversions); 

  } 

   

} // class end 

   

?>

demo示例代码如下:

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

require('HtmlAttributeFilter.class.php'); 

   

$str = '

'; 

   

$obj = new HtmlAttributeFilter(); 

   

// 允许id属性 

$obj->setAllow(array('id')); 

   

$obj->setException(array( 

  'a' => array('href'),  // a 标签允许有 href属性特例 

  'ul' => array('class') // ul 标签允许有 class属性特例 

)); 

   

// img 标签忽略,不过滤任何属性 

$obj->setIgnore(array('img')); 

   

echo 'source str:
'; 

echo htmlspecialchars($str).'

'; 

echo 'filter str:
'; 

echo htmlspecialchars($obj->strip($str)); 

?>

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools