About PHP strip_tags retaining multiple HTML tags

This article mainly introduces the method of PHP strip_tags to retain multiple HTML tags. Friends who need it can refer to it.

This article introduces the method of PHP strip_tags function to retain multiple HTML tags. You can use the second one. Parameters to set tags that do not need to be deleted, mainly involving the second parameter of strip_tags

strip_tags function

Syntax
string strip_tags (string str [, string allowable_tags] )
Returns a string with HTML tags removed; you can use the second parameter to set tags that do not need to be deleted.

Usage:

Premise: If there is such a string now,

$str = "<p>我来自<b><a href=&#39;//www.php.cn&#39;>php中文网</a></b></p>";

1, without retaining any HTML tags, the code will be like this:

echo strip_tags($str); 
// 输出：我来自php中文网

2. If you want to retain only the tag, you only need to write the string into the second parameter of strip_tags:

echo strip_tags($str, "<a>"); 
// 输出：我来自<a href=&#39;//www.php.cn&#39;>php中文网</a>

3. To retain the ... multiple tags, just separate the multiple tags with spaces and write them to the second parameter of strip_tags:

echo strip_tags($str, "<p> <b>"); 
// 输出：<p>我来自<b>php中文网</b></p>

If you want to use php to delete html What about specific tags in markup?

This requires code to implement, as follows:

function strip_selected_tags($text, $tags = array()) {
  $args = func_get_args();
  $text = array_shift($args);
  $tags = func_num_args() > 2 ? array_diff($args, array($text)) : (array) $tags;
  foreach($tags as $tag) {
    if (preg_match_all(&#39;/<&#39;.$tag.
        &#39;[^>]*>([^<]*)</&#39;.$tag.
        &#39;>/iu&#39;, $text, $found)) {
      $text = str_replace($found[0], $found[1], $text);
    }
  }

  return preg_replace(&#39;/(<(&#39;.join(&#39;|&#39;, $tags).
    &#39;)( | |.)*/>)/iu&#39;, &#39;&#39;, $text);
}

$str = "[url="] 123[/url]";
    echo strip_selected_tags($str, array(&#39;b&#39;));

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