Transform script for processing of multiple cURL handles in parallel

function my_curl($url) {
// HEADERS FROM FIREFOX - APPEARS TO BE A BROWSER REFERRED BY GOOGLE
        $curl = curl_init();
 
        $header[] = "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
        $header[] = "Cache-Control: max-age=0";
        $header[] = "Connection: keep-alive";
        $header[] = "Keep-Alive: 300";
        $header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
        $header[] = "Accept-Language: en-us,en;q=0.5";
        $header[] = "Pragma: "; // browsers keep this blank.
 
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.15) Gecko/20080623 Firefox/2.0.0.15');
        curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
        curl_setopt($curl, CURLOPT_REFERER, 'http://www.google.com');
        curl_setopt($curl, CURLOPT_ENCODING, 'gzip,deflate');
        curl_setopt($curl, CURLOPT_AUTOREFERER, true);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_TIMEOUT, 1);
 
        if (!$html = curl_exec($curl)) { $html = FALSE; }
        curl_close($curl);
return $html;
}
 
$urlc_result = mysql_query("SELECT * FROM urls where palavra = '$palavradb'", $db);
$urlc_rows = mysql_num_rows($urlc_result);
while($urlc = mysql_fetch_object($urlc_result)) { //1000
	$ee = my_curl("$urlc->url");
	if ($ee == FALSE){ //2000
		echo "false";
			} else { //M2000
		$codigo = $ee;
mysql_query("insert into sites set url_bruto = '$urlc->url', contain = '$codigo'", $db);
                        }
                }

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