Strips out html (person importing content from Blogger)

Strip_html

<?php

$content = strip_tags($_POST['content'],"<p><br><a>");
lib_xml_use_internal_errors(true);
$DOM = new DOMDocument($content);
foreach($dom->getElementsByTagName($tagname) as $tag) {
    if ($tag->hasAttributes()) {
        foreach($tag->attributes as $attribute) {
            if ($attribute->nodeName !== "href")
                $tag->removeAttribute($attribute->nodeName);
        }
    }
}
$newContent = $dom->saveHTML();