<?

function ultima_foto() {
   
   $anys = opendir('.');
   $max_any = '0000';
      
   while (false !== ($any = readdir($anys))) {
      if (is_dir("$any") and (int)$any > 2000 and (int)$any < 2100 and (int)$any > (int)$max_any) {
         $max_any = $any;
      }
   }

   closedir($anys);

   if ($max_any === '0000') {

      $data = date('YmdHi');
   
   } else {

      $mesos = opendir("$max_any");
      $max_mes = '00';
         
      while (false !== ($mes = readdir($mesos))) {
         if (is_dir("$max_any/$mes") and (int)$mes > 0 and (int)$mes < 13 and (int)$mes > (int)$max_mes) {
            $max_mes = $mes;
         }
      }

      closedir($mesos);

      if ($max_mes === '00') {

         $data = date('YmdHi');
      
      } else {

         $dies = opendir("$max_any/$max_mes");
         $max_dia = '0000';
            
         while (false !== ($dia = readdir($dies))) {
            if (is_dir("$max_any/$max_mes/$dia") and (int)$dia > 0 and (int)$dia < 1232 and (int)$dia > (int)$max_dia) {
               $max_dia = $dia;
            }
         }

         closedir($dies);
   
         if ($max_dia === '0000') {

            $data = date('YmdHi');
         
         } else {
            
            $ls = explode("\n", trim(`/bin/ls -X -1 $max_any/$max_mes/$max_dia/$max_dia??????.jpg`));
            
            if ($sls = sizeof($ls)) {
               $data = $max_any . substr($ls[$sls -1], 13, 8);
            } else {
               $data = date('YmdHi');
            }
         }
      }
   }
   return $data;
}
       
?>