PHP filter html tag attribute class usage example_PHP tutorial

PHP filter html tag attribute class usage example

The specific method is as follows:

HtmlAttributeFilter.class.php class file is as follows:

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/** HTML Attribute Filter * Date: 2013-09-22 * Author: fdipzone * ver: 1.0 * * Func: * public strip filter attribute * public setAllow Set allowed attributes * public setException Set special case * public setIgnore Set the ignored mark * private findElements Search for elements that need to be processed * private findAttributes Search attributes * private removeAttributes Remove attributes * private isException Determine whether it is a special case * private createAttributes Create attributes * private protect special character escaping */ class HtmlAttributeFilter{ // class start private $_str = ''; // source string private $_allow = array(); // Allowed retained attributes For example: array('id','class','title') private $_exception = array(); // Special example: array('a'=>array('href','class'),'span'=>array('class')) private $_ignore = array(); // Ignore filtered tags For example: array('span','img') /**Process HTML, filter attributes that are not retained * @param String $str source string * @return String */ public function strip($str){ $this->_str = $str; if(is_string($this->_str) && strlen($this->_str)>0){ // Determine the string $this->_str = strtolower($this->_str); // Convert to lowercase $res = $this->findElements(); if(is_string($res)){ return $res; } $nodes = $this->findAttributes($res); $this->removeAttributes($nodes); } return $this->_str; } /**Set allowed attributes * @param Array $param */ public function setAllow($param=array()){ $this->_allow = $param; } /**Set up special case * @param Array $param */ public function setException($param=array()){ $this->_exception = $param; } /**Set ignored tags * @param Array $param */ public function setIgnore($param=array()){ $this->_ignore = $param; } /**Search for elements to be processed*/ 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;      }    }        /**Search properties * @param Array $nodes elements to be processed */    private function findAttributes($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;    }        /**Remove attribute * @param Array $nodes elements to be processed */    private function removeAttributes($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) ? "<$node_name $new_attributes>" : "<$node_name>";        $this->_str = preg_replace('/'.$this->protect($node['literal']).'/', $replacement, $this->_str);      }    }        /**Determine whether it is a special case * @param String $element_name Element name * @param String $attribute_name attribute name * @param Array $exceptions Allowed exceptions * @return boolean */    private function isException($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;    }            /**Special character escaping * @param String $str source string * @return String */    private function protect($str){      $conversions = array(        "^" => "^",         "[" => "[",         "." => ".",         "$" => "$",         "{" => "{",         "*" => "*",         "(" => "(",         "\" => "\\",         "/" => "/",         "+" => "+",         ")" => ")",         "|" => "|",         "?" => "?",         "<" => "<",         ">" => ">"       );      return strtr($str, $conversions);    }      } // class end      ?>

demo示例代码如下：

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require('HtmlAttributeFilter.class.php'); $str = ' yuna love want to knowYES ';      $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));  ?>

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<🎜>require('HtmlAttributeFilter.class.php'); <🎜> <🎜>   <🎜> <🎜>$str = '

• 
  yuna

  love

  want to knowYES

';      $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));  ?>

http://www.bkjia.com/PHPjc/883507.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/883507.htmlTechArticlephp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...