按每个内部数组中的最后一个值对2D数组排序

Question

I have an array of arrays and all of the inner-arrays contain 4 strings and an int.

Right now, I am traveling through the arrays with a foreach and I am looking for help sorting the inner arrays by the number ( the last item ) so that the higher / larger ones are first and then transferring them into a new array that is sorted in that manner.

$twoDUnsorted = array(
    array(
        0=>"the",
        1=>"quick",
        2=>"brown",
        3=>"fox",
        4=>650
    ),
    array(
        0=>"jumps",
        1=>"over",
        2=>"the",
        3=>"lazy",
        4=>420
    ),
    array(
        0=>"it",
        1="was",
        2=>"the",
        3=>"worst"
        4=>1016
    ),
    array(
        0=>"of",
        1=>"times",
        2=>"it",
        3=>"was",
        4=>768
    ),
    array(
        0=>"the",
        1=>"best",
        2=>"of",
        3=>"times,
        4=>123
   )
);

and then one travels through it with a for each, sorts it by the last item in each inner array, and then uses array_push to push the arrays into a new 2D array in order.

So the new 2D array would look like:

$twoDSorted = array(
    array(
        0=>"it",
        1="was",
        2=>"the",
        3=>"worst"
        4=>1016
    ),
    array(
        0=>"of",
        1=>"times",
        2=>"it",
        3=>"was",
        4=>768
    ),
    array(
        0=>"the",
        1=>"quick",
        2=>"brown",
        3=>"fox",
        4=>650
    ),
    array(
        0=>"jumps",
        1=>"over",
        2=>"the",
        3=>"lazy",
        4=>420
    ),
    array(
        0=>"the",
        1=>"best",
        2=>"of",
        3=>"times,
        4=>123
   )
);

I would appreciate any and all help sorting them and pushing them into the new array in order.

Answer 1

You can use usort() to sort the array however you'd like, and end() gets the last value in the array etc. so this would sort the array of arrays by the last index in each array, highest first :

function cmp($a, $b) {
    if (end($a) == end($b)) {
        return 0;
    }
    return (end($a) > end($b)) ? -1 : 1;
}

usort($twoDUnsorted, "cmp");

Answer 2

There is already a multi-dimensional sort function. I think the third example on this page should help you.