+function get_body_length($body) {
+ $string = trim($body);
+
+ // DomDocument doesn't like empty strings
+ if(! strlen($string)) {
+ return 0;
+ }
+
+ // We need to get rid of hidden tags (display: none)
+
+ // Get rid of the warning. It would be better to have some valid html as input
+ $dom = @DomDocument::loadHTML($body);
+ $xpath = new DOMXPath($dom);
+
+ /*
+ * Checking any possible syntax of the style attribute with xpath is impossible
+ * So we just get any element with a style attribute, and check them with a regexp
+ */
+ $xr = $xpath->query('//*[@style]');
+ foreach($xr as $node) {
+ if(preg_match('/.*display: *none *;.*/',$node->getAttribute('style'))) {
+ // Hidden, remove it from its parent
+ $node->parentNode->removeChild($node);
+ }
+ }
+ // Now we can get the body of our HTML DomDocument, it contains only what is visible
+ $string = $dom->saveHTML();
+
+ $string = strip_tags($string);
+ return strlen($string);
+}
+