下载 HTMLPurifier github地址：https://github.com/ezyang/htmlpurifier 并与public同层级

function removeXSS($data)
{
    require_once './HtmlPurifier/HTMLPurifier.auto.php'; 
    // require_once '../../../HTMLpurifier/HTMLPurifier.auto.php'; 
    $_clean_xss_config = \HTMLPurifier_Config::createDefault();
    $_clean_xss_config->set('Core.Encoding', 'UTF-8');
    // 设置保留的标签
    $_clean_xss_config->set('HTML.Allowed', 'div,b,strong,i,em,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src]');
    $_clean_xss_config->set('CSS.AllowedProperties', 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align');
    $_clean_xss_config->set('HTML.TargetBlank', TRUE);
    $_clean_xss_obj = new \HTMLPurifier($_clean_xss_config);
    // 执行过滤
    return $_clean_xss_obj->purify($data);
}