Table of Contents
php过滤html标记属性类用法实例
Home php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
html php specific Example Attributes method mark usage kind filter

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 of this Website
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

Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Nordhold: Fusion System, Explained
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1667
14
PHP Tutorial
1273
29
C# Tutorial
1255
24
PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python: Code Examples and Comparison PHP and Python: Code Examples and Comparison Apr 15, 2025 am 12:07 AM

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP's Purpose: Building Dynamic Websites PHP's Purpose: Building Dynamic Websites Apr 15, 2025 am 12:18 AM

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP: Handling Databases and Server-Side Logic PHP: Handling Databases and Server-Side Logic Apr 15, 2025 am 12:15 AM

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

HTML: The Structure, CSS: The Style, JavaScript: The Behavior HTML: The Structure, CSS: The Style, JavaScript: The Behavior Apr 18, 2025 am 12:09 AM

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

Choosing Between PHP and Python: A Guide Choosing Between PHP and Python: A Guide Apr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Python: A Deep Dive into Their History PHP and Python: A Deep Dive into Their History Apr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

See all articles