<?php

  $url = "dirección_url";
  $postfield = 'campos_del_form';

  $options = array(CURLOPT_RETURNTRANSFER => true, CURLOPT_HEADER => true, CURLOPT_FOLLOWLOCATION => false, CURLOPT_ENCODING => "", CURLOPT_USERAGENT => "googlebot", CURLOPT_AUTOREFERER => true, CURLOPT_CONNECTTIMEOUT => 120, CURLOPT_TIMEOUT => 120, CURLOPT_MAXREDIRS => 10, CURLOPT_POST => 2, CURLOPT_POSTFIELDS => "$postfield");

 for($i=0;$i<=VALOR_MAXIMO;$i++)
 {
     $ch = curl_init($url);
     curl_setopt_array($ch, $options);
     $content = curl_exec($ch);
     curl_close($ch);
 }

 echo $content;
?>