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PHP method to implement html tag completion and filtering of web content

May 23, 2018 pm 02:31 PM
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这篇文章主要介绍了PHP实现网页内容html标签补全和过滤的方法,结合实例形式分析了php常见的标签检查、补全、闭合、过滤等相关操作技巧,需要的朋友可以参考下

本文实例讲述了PHP实现网页内容html标签补全和过滤的方法。分享给大家供大家参考,具体如下:

如果你的网页内容的html标签显示不全,有些表格标签不完整而导致页面混乱,或者把你的内容之外的局部html页面给包含进去了,我们可以写个函数方法来补全html标签以及过滤掉无用的html标签.

php使HTML标签自动补全,闭合,过滤函数方法一:

代码:

function closetags($html) {
 preg_match_all(&#39;#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?<![/|/ ])>#iU&#39;, $html, $result);
 $openedtags = $result[1];
 preg_match_all(&#39;#</([a-z]+)>#iU&#39;, $html, $result);
 $closedtags = $result[1];
 $len_opened = count($openedtags);
 if (count($closedtags) == $len_opened) {
    return $html;
 }
 $openedtags = array_reverse($openedtags);
 for ($i=0; $i < $len_opened; $i++) {
    if (!in_array($openedtags[$i], $closedtags)) {
     $html .= &#39;</&#39;.$openedtags[$i].&#39;>&#39;;
    }else {
     unset($closedtags[array_search($openedtags[$i], $closedtags)]);
    }
 }
 return $html;
}
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closetags()解析:

array_reverse() : 此函数将原数组中的元素顺序翻转,创建新的数组并返回。如果第二个参数指定为 true,则元素的键名保持不变,否则键名将丢失。

array_search() : array_search(value,array,strict),此函数与in_array()一样在数组中查找一个键值。如果找到了该值,匹配元素的键名会被返回。如果没找到,则返回 false。 如果第三个参数strict被指定为 true,则只有在数据类型和值都一致时才返回相应元素的键名。

php使HTML标签自动补全,闭合,过滤函数方法二:

function checkhtml($html) {
  $html = stripslashes($html);
    preg_match_all("/\<([^\<]+)\>/is", $html, $ms);
    $searchs[] = &#39;<&#39;;
    $replaces[] = &#39;<&#39;;
    $searchs[] = &#39;>&#39;;
    $replaces[] = &#39;>&#39;;
    if($ms[1]) {
      $allowtags = &#39;img|font|p|table|tbody|tr|td|th|br|p|b|strong|i|u|em|span|ol|ul|li&#39;;//允许的标签
      $ms[1] = array_unique($ms[1]);
      foreach ($ms[1] as $value) {
        $searchs[] = "<".$value.">";
        $value = shtmlspecialchars($value);
        $value = str_replace(array(&#39;\\&#39;,&#39;/*&#39;), array(&#39;.&#39;,&#39;/.&#39;), $value);
        $value = preg_replace(array("/(javascript|script|eval|behaviour|expression)/i", "/(\s+|"|&#39;)on/i"), array(&#39;.&#39;, &#39; .&#39;), $value);
        if(!preg_match("/^[\/|\s]?($allowtags)(\s+|$)/is", $value)) {
          $value = &#39;&#39;;
        }
        $replaces[] = empty($value)?&#39;&#39;:"<".str_replace(&#39;"&#39;, &#39;"&#39;, $value).">";
      }
    }
    $html = str_replace($searchs, $replaces, $html);
  return $html;
}
//取消HTML代码
function shtmlspecialchars($string) {
  if(is_array($string)) {
    foreach($string as $key => $val) {
      $string[$key] = shtmlspecialchars($val);
    }
  } else {
    $string = preg_replace(&#39;/&((#(\d{3,5}|x[a-fA-F0-9]{4})|[a-zA-Z][a-z0-9]{2,5});)/&#39;, &#39;&\\1&#39;,
      str_replace(array(&#39;&&#39;, &#39;"&#39;, &#39;<&#39;, &#39;>&#39;), array(&#39;&&#39;, &#39;"&#39;, &#39;<&#39;, &#39;>&#39;), $string));
  }
  return $string;
}
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checkhtml($html)解析:

stripslashes():函数删除由addslashes()函数添加的反斜杠。该函数用于清理从数据库或HTML表单中取回的数据。

以上就是本文的全部内容,希望对大家的学习有所帮助。


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