Php extracts some characters from the array and sorts them by characters

Php extracts some characters from the array and sorts them according to the characters. assume there is an array $ a & nbsp; array (2013aaa, 2011bb, 2015c ); in fact, this prime group is obtained from the database. the format is the first four words and four digits. I want to sort by 2013.2011.2015. The result is: 2011bb, 2013aaa, and 5C 5C. I don't know how to implement this? Php extracts some characters from the array and sorts them by characters
Suppose there is an array $ a = array ("2013aaa", "2011bb", "2015c ");
In fact, this prime group is obtained from the database. the format is the first four words and four digits.
I want to sort by 2013.2011.2015. The result is as follows:
2011bb, 2013aaa, 2015c
I don't know how to implement this?

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------ Solution --------------------
Isn't the direct order by field asc enough?
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$ A = array ("2013aaa", "2011bb", "2015c ");
Sort ($ );
Print_r ($ );

Array
(
[0] => 2011bb
[1] => 2013aaa
[2] => 2015c
)

------ Solution --------------------
After the problem is solved, paste it.