I made a small change. Now it takes care of points in numbers

function ucsentence ($string){
   $string = explode ('.', $string);
   $count = count ($string);
   for ($i = 0; $i < $count; $i++){
       $string[$i]  = ucfirst (trim ($string[$i]));
       if ($i > 0){
           if ((ord($string[$i]{0})<48) || (ord($string[$i]{0})>57)) {
              $string[$i] = ' ' . $string[$i];
           }   
       }
   }
   $string = implode ('.', $string);
   return $string;
}