xml_escape example

$this->content_ns_decls = array();

            if($this->is_html || $this->is_text)
                trigger_error("Invalid content in element found. Content must not be of type text or html if it contains markup.");

            $attrs_prefix = array();

            // resolve prefixes for attributes             foreach($attrs as $key => $value) {
                $with_prefix = $this->ns_to_prefix($key, true);
                $attrs_prefix[$with_prefix[1]] = $this->xml_escape($value);
            }

            $attrs_str = join(' ', array_map($this->map_attrs_func, array_keys($attrs_prefix), array_values($attrs_prefix)));
            if(strlen($attrs_str) > 0) {
                $attrs_str = " " . $attrs_str;
            }

            $with_prefix = $this->ns_to_prefix($name);

            if(!$this->is_declared_content_ns($with_prefix[0])) {
                array_push($this->content_ns_decls, $with_prefix[0]);
            }