


PHP method to implement html tag completion and filtering of web content
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('#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?<![/|/ ])>#iU', $html, $result); $openedtags = $result[1]; preg_match_all('#</([a-z]+)>#iU', $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)) { $html .= '</'.$openedtags[$i].'>'; }else { unset($closedtags[array_search($openedtags[$i], $closedtags)]); } } return $html; }
closetags()
解析:
array_reverse()
: 此函数将原数组中的元素顺序翻转,创建新的数组并返回。如果第二个参数指定为 true,则元素的键名保持不变,否则键名将丢失。
array_search()
: array_search(value,array,strict),此函数与in_array()一样在数组中查找一个键值。如果找到了该值,匹配元素的键名会被返回。如果没找到,则返回 false。 如果第三个参数strict被指定为 true,则只有在数据类型和值都一致时才返回相应元素的键名。
php使HTML标签自动补全,闭合,过滤函数方法二:
function checkhtml($html) { $html = stripslashes($html); preg_match_all("/\<([^\<]+)\>/is", $html, $ms); $searchs[] = '<'; $replaces[] = '<'; $searchs[] = '>'; $replaces[] = '>'; if($ms[1]) { $allowtags = 'img|font|p|table|tbody|tr|td|th|br|p|b|strong|i|u|em|span|ol|ul|li';//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('\\','/*'), array('.','/.'), $value); $value = preg_replace(array("/(javascript|script|eval|behaviour|expression)/i", "/(\s+|"|')on/i"), array('.', ' .'), $value); if(!preg_match("/^[\/|\s]?($allowtags)(\s+|$)/is", $value)) { $value = ''; } $replaces[] = empty($value)?'':"<".str_replace('"', '"', $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('/&((#(\d{3,5}|x[a-fA-F0-9]{4})|[a-zA-Z][a-z0-9]{2,5});)/', '&\\1', str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $string)); } return $string; }
checkhtml($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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