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