Returns a correctly ordered and delimited locale ID the keys identify the
particular locale ID subtags, and the values are the associated subtag
values.
Parameters
subtags
an array containing a list of key-value pairs, where the keys identify
the particular locale ID subtags, and the values are the associated
subtag values.
Note:
The 'variant' and 'private' subtags can take maximum 15 values
whereas 'extlang' can take maximum 3 values.e.g. Variants are allowed
with the suffix ranging from 0-14. Hence the keys for the input array
can be variant0, variant1, ...,variant14. In the returned locale id,
the subtag is ordered by suffix resulting in variant0 followed by
variant1 followed by variant2 and so on.
The 'variant', 'private' and 'extlang' multiple values can be specified both
as array under specific key (e.g. 'variant') and as multiple numbered keys
(e.g. 'variant0', 'variant1', etc.).