Strip HTML tags, remove attributes and empty tags

strip_html_content.php

<?php
/**
 * Strip HTML tags, remove attributes and empty tags
 * 
 * @param string $html — HTML string
 * @param array $preserve_tags — HTML tags that you wnat preserve
 * @param array $remove_attrs — HTML attributes that you want remove. You can use remove attributes that starts with
 * @param bool $remove_empty_tags — remove empty tags, that is without content
 * @return string
 */
function strip_html_content(
    string $html, 
    array $preserve_tags = ['p', 'br', 'b', 'strong', 'i', 'em', 'ul', 'ol', 'li', 's', 'a'], 
    array $remove_attrs = ['style', 'data-*', 'id', 'class', 'on*'],
    bool $remove_empty_tags = true
): string{
    $return = null;
    if(!empty($preserve_tags))
        $return = $striped_tags = strip_tags($html, '<'.implode('><', array_values($preserve_tags)).'>');
    
    if(!empty($remove_attrs)){
        $regex_rm_attr = implode('|', $remove_attrs);
        $regex_rm_attr = str_replace("*", "[a-z]+", $regex_rm_attr);
        $regex_rm_attr = '/ ('.$regex_rm_attr.')="[^\"]*"/m';
    
        $return = $striped_attr = preg_replace($regex_rm_attr, '', $return);
    }
    
    //adapted from https://stackoverflow.com/a/29177760/4830771
    if($remove_empty_tags){
        $return = str_replace( '>&nbsp;<', '> <', $return); //replace blank space html entity to blank space char
        do {
            $tmp = $return;
            $return = preg_replace('#<([^ >]+)[^>]*>[[:space:]]*</\1>#', '', $return);
        } while ($return !== $tmp);
    }
    return $return;
}

$html = "<p onclick=\"alert('')\"><a class=\"_58cn\" data-ft=\"{&quot;tn&quot;:&quot;*N&quot;,&quot;type&quot;:104}\" href=\"https://www.facebook.com/hashtag/sol%C3%ADlovers\" style=\"color:#365899; cursor:pointer; text-decoration-line:none; font-family:Helvetica, Arial, sans-serif; font-size:14px; background-color:#ffffff\">#solílovers</a><span style=\"font-size:14px\"><span style=\"color:#1d2129\"><span style=\"font-family:Helvetica, Arial, sans-serif\"><span style=\"background-color:#ffffff\"> Amanhã temos descontos na nossa loja de calçados na coleção nova... Além do Super Bazar do Pátio!</span></span></span></span></p><p>&nbsp;</p><p>&nbsp;</p><p><span style=\"font-size:11px;\"><em>Pátio Buriti<br />Feira de Santana-Bahia<br />(75) 3021-0821</em></span></p><p>&nbsp;</p><p><span style=\"font-size:11px;\"><em data-test=\"aaaaaaa\"><a href=\"http://www.okad.com.br/soli\">www.okad.com.br/soli</a></em></span></p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>";
echo strip_html_content($html);
?>