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PHP function array_multisort() has 6 arguments:

&&arr1 required
[&$SORT_ASC_or_SORT_DESC] optional
[&$SORT_REGULAR_or_SORT_NUMERIC_or_SORT_STRING] optional
[&$arr2] optional
[&$SORT_ASC_or_SORT_DESC] optional
[&$SORT_REGULAR_or_SORT_NUMERIC_or_SORT_STRING] optional

Full syntax: array_multisort(&&arr1, [&$SORT_ASC_or_SORT_DESC], [&$SORT_REGULAR_or_SORT_NUMERIC_or_SORT_STRING], [&$arr2], [&$SORT_ASC_or_SORT_DESC], [&$SORT_REGULAR_or_SORT_NUMERIC_or_SORT_STRING])

See PHP documentation: http://php.net/array_multisort

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