PHP如何去掉HTML标签？
在PHP中可以使用“strip_tags()”函数去掉HTML标签，该函数作用是从字符串中去除HTML和PHP标记，其语法是“strip_tags(str) ”，其参数str代表的是要去除标记的字符串，返回值为处理后的字符串。
演示示例
<?php $text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>'; echo strip_tags($text); echo "\n"; // 允许 <p> 和 <a> echo strip_tags($text, '<p><a>'); ?>
以上例程会输出：
Test paragraph. Other text <p>Test paragraph.</p> <a href="#fragment">Other text</a>
使用示例
<?php
function strip_tags_content($text, $tags = '', $invert = FALSE) {
preg_match_all('/<(.+?)[\s]*\/?[\s]*>/si', trim($tags), $tags);
$tags = array_unique($tags[1]);
if(is_array($tags) AND count($tags) > 0) {
if($invert == FALSE) {
return preg_replace('@<(?!(?:'. implode('|', $tags) .')\b)(\w+)\b.*?>.*?</\1>@si', '', $text);
}
else {
return preg_replace('@<('. implode('|', $tags) .')\b.*?>.*?</\1>@si', '', $text);
}
}
elseif($invert == FALSE) {
return preg_replace('@<(\w+)\b.*?>.*?</\1>@si', '', $text);
}
return $text;
}
?><?php
function stripUnwantedTagsAndAttrs($html_str){
$xml = new DOMDocument();
//Suppress warnings: proper error handling is beyond scope of example
libxml_use_internal_errors(true);
//List the tags you want to allow here, NOTE you MUST allow html and body otherwise entire string will be cleared
$allowed_tags = array("html", "body", "b", "br", "em", "hr", "i", "li", "ol", "p", "s", "span", "table", "tr", "td", "u", "ul");
//List the attributes you want to allow here
$allowed_attrs = array ("class", "id", "style");
if (!strlen($html_str)){return false;}
if ($xml->loadHTML($html_str, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD)){
foreach ($xml->getElementsByTagName("*") as $tag){
if (!in_array($tag->tagName, $allowed_tags)){
$tag->parentNode->removeChild($tag);
}else{
foreach ($tag->attributes as $attr){
if (!in_array($attr->nodeName, $allowed_attrs)){
$tag->removeAttribute($attr->nodeName);
}
}
}
}
}
return $xml->saveHTML();
}推荐教程：《PHP教程》
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