What is the purpose of the "inverse" function of strip_tags in PHP?

The purpose of the "inverse" function of strip_tags in PHP is to remove all HTML tags from a string except the specified tags. This can be useful when you want to allow certain tags (such as <b> or <i>) to be displayed in the output while still removing all other tags for security or formatting reasons. 

function strip_tags_except($string, $allowed_tags) {
    return strip_tags($string, &#039;&lt;&#039; . implode(&#039;&gt;&lt;&#039;, $allowed_tags) . &#039;&gt;&#039;);
}

// Example usage
$string = &#039;&lt;p&gt;This is &lt;b&gt;bold&lt;/b&gt; and &lt;i&gt;italic&lt;/i&gt; text.&lt;/p&gt;&#039;;
$allowed_tags = [&#039;b&#039;, &#039;i&#039;];
echo strip_tags_except($string, $allowed_tags);

Keywords

strip_tags inverse function PHP HTML security

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