How to delete specified html tags in php

php method to delete specified html tags: 1. Use strip_tags() function, syntax "strip_tags(string,allow)"; 2. Use strip_html_tags() function, syntax "strip_html_tags(tags,str)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php delete the specified html Tag method

$str='<p></p><p>这里是p标签</p><img  src="/static/imghwm/default1.png" data-src="" class="lazy" alt="How to delete specified html tags in php" ><a>这里是a标签</a><br>';

1: Delete all or keep the specified html tags

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

Usage:

strip_tags(string,allow)

• string: the string that needs to be processed;

• allow: the specified tag that needs to be retained, you can write Multiple;

echo strip_tags($str,'<p><a>');//输出：<p>这里是p标签</p></a><a>这里是a标签</a></p>

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

But the shortcomings are also obvious;

If there are a lot of tags;

And I just want to delete the specified 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 that need to be deleted (array format)

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

function strip_html_tags($tags,$str){
    $html=array();
    foreach ($tags as $tag) {
        $html[]="/(]*>)/i";
    }
    $data=preg_replace($html, '', $str);
    return $data;
}
echo strip_html_tags(array('p','img'),$str);
//输出：<div>这里是p标签<a>这里是a标签</a><br>
</div>;

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