+/** Check if the input data can be seen as an integer.
+ */
+function can_convert_to_integer($data)
+{
+ return is_int($data) || ctype_digit($data);
+}
+
+/** Interpret the input data as an integer or return false.
+ */
+function to_integer($data)
+{
+ if (!can_convert_to_integer($data)) {
+ return false;
+ }
+ return intval($data);
+}
+