按定义的顺序对多维数组进行排序[重复]

Question

This question already has an answer here:

• How can I sort arrays and data in PHP? 10 answers

I have this example array, and I would like to sort each first level item (66000, 66001, 66002) in this order: New Store first in the list, Store Relocation second in the list, and I didn't include Underperforming Stores in the example array, but those would be last. those then need to be sorted by open date How can I sort them this way?

I believe I need to use usort to accomplish this, but I don't really understand the usort function, can I get help with this?

Here is my function so far...

usort($mainpgArr, function($a, $b){

});

Example Original Array:

Array(
    [66000] => Array(
        [January] => Array(
            [status] => New Store
            [sales] => 100.00
            [open] => 2013-05-01
        )
        [February] => Array(
            [status] => New Store
            [sales] => 200.00
            [open] => 2013-05-01
        )
        [March] => Array(
            [status] => New Store
            [sales] => 140.00
            [open] => 2013-05-01
        )
    )
    [66001] => Array(
        [January] => Array(
            [status] => Store Relocation
            [sales] => 3400.00
            [open] => 2013-07-01
        )
        [February] => Array(
            [status] => Store Relocation
            [sales] => 1340.00
            [open] => 2013-07-01
        )
        [March] => Array(
            [status] => Store Relocation
            [sales] => 1550.00
            [open] => 2013-07-01
        )
    )
    [66002] => Array(
        [January] => Array(
            [status] => New Store
            [sales] => 1050.00
            [open] => 2013-01-01
        )
        [February] => Array(
            [status] => New Store
            [sales] => 1009.00
            [open] => 2013-01-01
        )
        [March] => Array(
            [status] => New Store
            [sales] => 1020.00
            [open] => 2013-01-01
        )
    )
)

Example Final Array

Array(
    [66002] => Array(
        [January] => Array(
            [status] => New Store
            [sales] => 1050.00
            [open] => 2013-01-01
        )
        [February] => Array(
            [status] => New Store
            [sales] => 1009.00
            [open] => 2013-01-01
        )
        [March] => Array(
            [status] => New Store
            [sales] => 1020.00
            [open] => 2013-01-01
        )
    )
    [66000] => Array(
        [January] => Array(
            [status] => New Store
            [sales] => 100.00
            [open] => 2013-05-01
        )
        [February] => Array(
            [status] => New Store
            [sales] => 200.00
            [open] => 2013-05-01
        )
        [March] => Array(
            [status] => New Store
            [sales] => 140.00
            [open] => 2013-05-01
        )
    )
    [66001] => Array(
        [January] => Array(
            [status] => Store Relocation
            [sales] => 3400.00
            [open] => 2013-07-01
        )
        [February] => Array(
            [status] => Store Relocation
            [sales] => 1340.00
            [open] => 2013-07-01
        )
        [March] => Array(
            [status] => Store Relocation
            [sales] => 1550.00
            [open] => 2013-07-01
        )
    )
)

</div>

Answer 1

All you need to do in usort is define how any 2 given items should be ordered.

In your case it would be easier if your array data was tidied up a bit, by taking the status out of the month data. As is, we'll have to assume it will be the same for all months.

With that assumption made we will use the first months' status for our comparison.

usort($mainpgArr, function($a, $b){
   if ($a[0]['status'] == $b[0]['status']) {
       // status equal so sort by open date
       if ($a[0]['open'] == $b[0]['open']) {
           return 0;
       } else {
           return ($a[0]['open'] > $b[0]['open']) ? 1 : -1;
       } 
   } else {
       // sorting by status
       // we can use a simple comparison operation as your desired order happens to be alphabetical
       return ($a[0]['status'] > $b[0]['status']) ? 1 : -1;
   }
});

If the keys are important to you you'll need to look at using uasort as usort doesn't preserve keys.