public static function getAllIniPartCacheSubKeys()
{
$subKeys = [];
$chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
foreach ($chars as $charOne) {
foreach ($chars as $charTwo) {
foreach ($chars as $charThree) {
$subKeys[] = $charOne . $charTwo . $charThree;
}
}
}
return $subKeys;
}