Question

Hi I am actually trying to sort an array at third level with different keys.

The below is Sample array input.

Array
(
    [19067] => Array
        (
            [Morrisville, PA] => 5.02
        )

    [18977] => Array
        (
            [Washington Crossing, PA] => 6.63
        )

    [08695] => Array
        (
            [Trenton, NJ] => 2.84
        )

    [08690] => Array
        (
            [Trenton, NJ] => 1
        )

    [08666] => Array
        (
            [Trenton, NJ] => 2.84
        )

    [08650] => Array
        (
            [Trenton, NJ] => 0
        )

    [08648] => Array
        (
            [Lawrence Township, NJ] => 2.88
        )

    [08647] => Array
        (
            [Trenton, NJ] => 2.84
        )

    [08646] => Array
        (
            [Trenton, NJ] => 2
        )

)

Can any body help me to sort the above array at third level

Expected result should like:

Output:

Array
(
    [08650] => Array
        (
            [Trenton, NJ] => 0
        )

    [08690] => Array
        (
            [Trenton, NJ] => 1
        )   

     [08646] => Array
        (
            [Trenton, NJ] => 2
        )

    [08666] => Array
        (
            [Trenton, NJ] => 2.84
        )   

    [08695] => Array
        (
            [Trenton, NJ] => 2.84
        )

    [08647] => Array
        (
            [Trenton, NJ] => 2.84
        )

    [08648] => Array
        (
            [Lawrence Township, NJ] => 2.88
        )

    [19067] => Array
        (
            [Morrisville, PA] => 5.02
        )

    [18977] => Array
        (
            [Washington Crossing, PA] => 6.63
        )   


)

Thanks in advance..

Answer 1

uasort($array, function (array $a, array $b) {
    return current($a) - current($b);
});

Do note the comments: values which differ less than 1.0 will be sorted as the same. You may want to do (current($a) - current($b)) * 100 or otherwise round the value, depending on what value ranges you expect.