1.把html元素全部去掉，或者保留某几个html标签

复制代码 代码如下:

<?php

$text = '<p>Test paragraph.</p><> <a href="#fragment">Other text</a>';

echo strip_tags($text);

echo "/n";

// Allow <p> and <a>

echo strip_tags($text, '<p><a>');

?>

结果为(去掉了注释)：

<blockquote>Test paragraph. Other text

<p>Test paragraph.</p> <a href="#fragment">Other text</a></blockquote>2.相反，只去掉某一个html标签

复制代码 代码如下:

<?php

function strip_only($str, $tags, $stripContent = false) {

$content = '';

if(!is_array($tags)) {

$tags = (strpos($str, '>') !== false ? explode('>', str_replace('<', '', $tags)) : array($tags));

if(end($tags) == '') array_pop($tags);

}

foreach($tags as $tag) {

if ($stripContent)

$content = '(.+</'.$tag.'[^>]*>|)';

$str = preg_replace('#</?'.$tag.'[^>]*>'.$content.'#is', '', $str);

}

return $str;

}

$str = '<font color="red">red</font> text';

$tags = 'font';

$a = strip_only($str, $tags); // red text

$b = strip_only($str, $tags, true); // text

?>