+function get_unit($db,$param) {
+
+ $qug = $db -> prepare(
+ 'select u.id,u.unit_group from st_parameters st,units u where st.id='.$param.' and st.st_unit=u.id'
+ );
+ $qug -> execute();
+
+ while ($row = $qug -> fetch(PDO::FETCH_ASSOC)) {
+ $from_unit = $row['id'];
+ $unit_group = $row['unit_group'];
+ }
+
+ if (!empty($_COOKIE['unit_'.$unit_group])) {
+ $to_unit=intval($_COOKIE['unit_'.$unit_group]);
+ } else {
+ $to_unit=$from_unit;
+ }
+
+ $qu = $db -> prepare(
+ 'select u.name_short from units u where u.id='.$to_unit
+ );
+ $qu -> execute();
+
+ while ($row = $qu -> fetch(PDO::FETCH_ASSOC)) {
+ $param_unit = $row['name_short'];
+ }
+
+ return Array(
+ 'from' => $from_unit,
+ 'to' => $to_unit,
+ 'name' => $param_unit
+ );
+
+}
+
+function convert_unit($db,$value,$from,$to) {
+
+ if ($from==$to) {
+
+ $val = $value;
+
+ } else {
+
+ $qv = $db -> prepare(
+ 'select round(unitconv('.$value.','.$from.','.$to.'),2) res'
+ );
+ $qv -> execute();
+
+ while ($row = $qv -> fetch(PDO::FETCH_ASSOC)) {
+ $val = $row['res'];
+ }
+
+ }
+
+ return $val;
+
+}
+