How to clear html tags in php?

php method to clear html tags: 1. Use strip_tags() function to clear html tags, syntax "strip_tags(string)"; 2. Use strip_html_tags() function to delete specified html tags, this function can optionally delete Or keep the content within the tag.

Those who often pick up articles from other people’s websites; I mean those who collect in batches without reading the content at all; they will inevitably use the deletion of html tags Function; here are 3 methods for different purposes;

$str=&#39;<p><p>这里是p标签</p><img src="" alt="这里是img标签"><a href="">这里是a标签</a><br></p>&#39;;

1. Delete all or keep the specified html tags

The function strip_tags that comes with php can meet the requirements ,

strip_tags() function strips the HTML, XML and PHP tags in the string and returns the stripped string. [Recommended: "PHP Video Tutorial"]

Usage:

strip_tags(string,allow)；

• string: The string that needs to be processed;

• allow: Specified tags that need to be retained, you can write multiple;

Example 1:

echo strip_tags($str);
//输出：这里是p标签这里是a标签

Example 2:

echo strip_tags($str,&#39;<p><a>&#39;);
//输出：<p>这里是p标签</p><a href="">这里是a标签</a>

The advantage of this function is that it is simple and crude;

But the disadvantage is also obvious;

If there are a lot of tags;

And I just want to delete the specified one A certain one;

That requires writing a lot of tags that need to be retained;

So there is a second method;

2. Delete the specified html tag

Usage:

strip_html_tags($tags,$str)；

• $tags: tags to be deleted (array format)

• $str: required The string to be processed;

function strip_html_tags($tags,$str){
    $html=array();
    foreach ($tags as $tag) {
        $html[]="/(<(?:\/".$tag."|".$tag.")[^>]*>)/i";
    }
    $data=preg_replace($html, &#39;&#39;, $str);
    return $data;
}
echo strip_html_tags(array(&#39;p&#39;,&#39;img&#39;),$str);
//输出：<div>这里是p标签<a href="">这里是a标签</a><br></div>;

Many website articles will contain the website name and link;

For example,

<a href="http://www.php.cn">php中文网</a>；

This function is designed to handle this ;

Don’t use this function to collect this site;

Otherwise, I guarantee that I won’t beat you to death;

3. The ultimate function, delete the specified tag; delete or keep Content within the tag;

Usage:

strip_html_tags($tags,$str,$content);

• $tags: Tags to be deleted (array format)

• $str: the string that needs to be processed;

• $ontent: whether to delete the content in the tag 0 retain the content 1 do not retain the content
  

/**
 * 删除指定标签
 *
 * @param array $tags     删除的标签  数组形式
 * @param string $str     html字符串
 * @param bool $content   true保留标签的内容text
 * @return mixed
 */
function stripHtmlTags($tags, $str, $content = true)
{
    $html = [];
    // 是否保留标签内的text字符
    if($content){
        foreach ($tags as $tag) {
            $html[] = &#39;/(<&#39; . $tag . &#39;.*?>(.|\n)*?<\/&#39; . $tag . &#39;>)/is&#39;;
        }
    }else{
        foreach ($tags as $tag) {
            $html[] = "/(<(?:\/" . $tag . "|" . $tag . ")[^>]*>)/is";
        }
    }
    $data = preg_replace($html, &#39;&#39;, $str);
    return $data;
}
//输出<div><p>这里是p标签</p><img src="" alt="这里是img标签"><br></div>;

I have talked so much before;

In fact, this last function is the real thing;

It is not difficult to solve all kinds of difficult and complicated problems of tag deletion in one go;

Don’t look at the screenshot below;

It’s just a little color to look good;

I mainly used it to make up the picture for the cover of the article;

For more programming-related knowledge, please visit: Introduction to Programming! !

The above is the detailed content of How to clear html tags in php?. For more information, please follow other related articles on the PHP Chinese website!