/**
* Transforms tracking set for Drizzle, which has no SET type
*
* Converts int<>string for Drizzle, does nothing for MySQL
*
* @param int|string $tracking_set
* @return int|string
*/
static private function transformTrackingSet($tracking_set)
{
if (!PMA_DRIZZLE) {
return $tracking_set;
}
// init conversion array (key 3 doesn't exist in calculated array)
if (isset(self::$tracking_set_flags[3])) {
// initialize flags
$set = self::$tracking_set_flags;
$array = array();
for ($i = 0; $i < count($set); $i++) {
$flag = 1 << $i;
$array[$flag] = $set[$i];
$array[$set[$i]] = $flag;
}
self::$tracking_set_flags = $array;
}
if (is_numeric($tracking_set)) {
// int > string conversion
$aflags = array();
// count/2 - conversion table has both int > string and string > int values
for ($i = 0; $i < count(self::$tracking_set_flags)/2; $i++) {
$flag = 1 << $i;
if ($tracking_set & $flag) {
$aflags[] = self::$tracking_set_flags[$flag];
}
}
$flags = implode(',', $aflags);
} else {
// string > int conversion
$flags = 0;
foreach (explode(',', $tracking_set) as $strflag) {
if ($strflag == '') {
continue;
}
$flags |= self::$tracking_set_flags[$strflag];
}
}
return $flags;
}
