PHP Filter HTML tag attribute class Usage Example _php tips

This article describes the PHP filter HTML tag attribute class and its usage. is a more common practical skill in PHP project development. Share to everyone for your reference. The specific methods are as follows:

The HtmlAttributeFilter.class.php class files are as follows:

<?php/** HTML Attribute Filter * date:2013-09-22 * author:fdipzone * ver:1.0 * * Func: * Public stri  P Filter Properties * Public Setallow settings allowed properties * Public setexception Settings Exception * Public setignore settings ignored tags * private    Findelements search for elements to be processed * Private Findattributes search attribute * Private Removeattributes Remove attribute * Private isexception Judge whether special case * Private Createattributes Create attribute * Private protect Special word escape/class htmlattributefilter{/class Star      T private $_str = ';   SOURCE string Private $_allow = Array (); Properties that allow retention such as array (' ID ', ' class ', ' title ') Private $_exception = Array ();  Special cases such as: Array (' A ' =>array (' href ', ' class '), ' span ' =>array (' class ')) Private $_ignore = Array (); Ignore filtered tags For example: Array (' span ', ' img ')/** processing HTML, filtering attributes that are not preserved * @param string $str Source String * @return string/Pub 
 
    Lic function strip ($str) {$this->_str = $str; if (is_string ($this->_str) && strlen ($this->_str) >0) {//Judge characterstring $this->_str = Strtolower ($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 properties * @param Array $param/Public Function Setallow ($param =array ()) {$this->_allow = $pa 
  Ram /** Set 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 _ke 
    Y];    $element _name = $elements [1][$el _key]; 
        $attributes = $elements [2][$el _key]; if (Is_array ($this->_ignore) &&!in_array ($element _name, $this->_ignore)) {$nodes [] = Array (' Liter 
        Al ' => $literal, ' name ' => $element _name, ' attributes ' => $attributes); 
    }} if (! $nodes [0]) {return $this->_str; 
    }else{return $nodes; }/** Search Properties * @param Array $nodes elements to be handled */Private function findattributes ($nodes) {foreach ($node S 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 attributes * @param Array $nodes elements to be handled */Private function removeattributes ($nodes) {foreach ($nodes a 
      S $node) {$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 = $this->cre 
          Ateattributes ($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); 
}  /** to determine if a special case * @param string $element _name element name * @param string $attribute _name property name * @param Array $except 
    Ions Permitted Exceptions * @return Boolean/Private Function isexception ($element _name, $attribute _name, $exceptions) { if (array_key_exists ($element _name, $this->_exception)) {if (In_array ($attribute _name, $this->_exception[$ele 
      Ment_name])) {return true; 
  return false; 
  /** Create Property * @param string $new _attributes * @param string $name * @param string $value * @return string * * Private Function Createattributes ($new _attributes, $name, $value) {if ($new _attributes) {$new _attribut 
    Es. = ""; 
    $new _attributes. = "$name =\" $value \ ""; 
  return $new _attributes; /** Special Character Escape * @param string $str Source String * @return string/Private Function Protect ($STR) {$conver sions = Array ("^" => "\^", "[" => "\[", "." => "\.", "$" =&GT  "\$", "{" => "\{", "*" => "\*", "(" => "\", "\" => "\\\\", "/" => "\/", "+" => "\+", ")" => "\)", "|" => "\|", "?" => "\?", "<" =&gt ; 
    "\<", ">" => "\>"); 
  Return Strtr ($str, $conversions);

 }//Class end?>

The

Demo sample code is as follows:

<?php require (' HtmlAttributeFilter.class.php '); $str = ' <div class= "BD clearfix" id= "Index_hilite_ul" ><ul class= "list" ><li><div class=" cover "><a class=" text "href=" Http://www.jb51.net "> <strong>yuna</strong><p>love</p></a><strong class= "T g" >want to know</ Strong><a href= "/login.html" class= "ppbtn" ><strong "text" class= 
 
Div></li></ul></div> '; 
 
$obj = new Htmlattributefilter (); 
 
Allow ID attribute $obj->setallow (array (' ID ')); $obj->setexception (Array (' A ' => array (' href '),//A label allows the href attribute special case ' ul ' => Array (' class ')//UL tag allowed to have CLA 
 
SS attribute Special)); 
 
The IMG tag is ignored and does not filter any attributes $obj->setignore (Array (' IMG ')); 
echo ' Source str:<br> '; echo Htmlspecialchars ($str). ' 
<br><br> '; 
Echo ' Filter str:<br> '; 
Echo Htmlspecialchars ($obj->strip ($STR)); ?>

 

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