if($htm->find('img')){
foreach($htm->find('img') as $element) {
        $raw = file_get_contents_curl($element->src);
        $im = @imagecreatefromstring($raw);
        $width = @imagesx($im);
        $height = @imagesy($im);
        if($width>500&&$height>=350){
    $hasimg = '1';
        echo '<img src='' .$element->src. ''>';
        }

} // end foreach
} // end if htm

curl_setopt($ch, CURLOPT_PROTOCOLS, CURLPROTO_HTTP);

$url=$element->src;
if (substr($url, 0, 2)=='//') $url='http:'.$url;
$raw=file_get_contents_curl($url);

$doc = str_get_html('<img data-src="foo">');
echo $doc->find('img', 0)->getAttribute('data-src');
//=> outputs: foo