fixed int and float check

utils.php

   return get_param($_GET, $key, $is_error);
 }
 
-function check_float($f)
+function check_float($f, $def = null)
 {
-  return ($f == (string)(float)$f) ? $f : null;
+  return ($f == (string)(float)$f) ? $f : $def;
+}
+
+function check_int($i, $def = null)
+{
+  return is_numeric($i) ? $i : $def;
 }
 
 function check_table_field($header, $table, $field)