欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

php clean html代码(设置过滤及保留属性)

程序员文章站 2022-04-10 09:22:11
...
php实现的可以设置过滤及保留相关属性的代码,有需要的朋友可以参考下。

代码如下:

 "\^", "[" => "\[", "." => "\.", "$" => "\$", "{" => "\{", "*" => "\*", "(" => "\(", "\\" => "\\\\", "/" => "\/", "+" => "\+", ")" => "\)", "|" => "\|", "?" => "\?", " "\" => "\>" );  
        return strtr( $str, $conversions );  
}  
      
class cleanHtml{  
        public $str         = '';  
        public $allow       = array();  
        public $exceptions  = array();  
        public $ignore      = array();  
          
        public function strip( $str )  
        {  
            $this->str = $str;  
              
            if( is_string( $str ) && strlen( $str ) > 0 )  
            {  
                $res = $this->findElements();  
                if( is_string( $res ) )  
                    return $res;  
                $nodes = $this->findAttributes( $res );  
                $this->removeAttributes( $nodes );  
            }  
              
            return $this->str;  
        }  
          
        private function findElements()  
        {  
              
            # Create an array of elements with attributes  
            $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 );  
                }  
            }  
              
            # Return the XML if there were no attributes to remove  
            if( !$nodes[0] )  
                return $this->str;  
            else  
                return $nodes;  
        }  
          
        private function findAttributes( $nodes )  
        {  
              
            # Extract attributes  
            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;  
        }  
          
        private function removeAttributes( $nodes )  
        {  
              
            # Remove unwanted attributes  
            foreach( $nodes as $node )  
            {  
                  
                # Check if node has any attributes to be kept  
                $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->exceptions ) )  
                            $new_attributes = $this->createAttributes( $new_attributes, $attribute['name'], $attribute['value'] );  
                    }  
                }  
                $replacement = ( $new_attributes ) ? "" : "";  
                $this->str = preg_replace( '/'. reg_escape( $node['literal'] ) .'/', $replacement, $this->str );  
            }  
              
        }  
          
        private function isException( $element_name, $attribute_name, $exceptions )  
        {  
            if( array_key_exists($element_name, $this->exceptions) )  
            {  
                if( in_array( $attribute_name, $this->exceptions[$element_name] ) )  
                    return true;  
            }  
              
            return false;  
        }  
          
        private function createAttributes( $new_attributes, $name, $value )  
        {  
            if( $new_attributes )  
                $new_attributes .= " ";  
            $new_attributes .= "$name=\"$value\"";  
              
            return $new_attributes;  
        }  
      
    }  
?>
2、调用示例:
 getting broken    php clean html代码(设置过滤及保留属性)';  
      
$sa = new cleanHtml;  //声明实例
$sa->allow = array( 'id' );    
      
$sa->exceptions = array(  
    'img' => array( 'src', 'alt' ),  
     'a' => array( 'href', 'title' ),  
   'iframe'=>array('src','frameborder'),  
);  
echo $str = $sa->strip( $str );
?>