php multilevel array sort by su-sub-sub array value

Question

I have a multilevel array as below

array( 
    (int)0=>array(
              'User' => array(
        'PostType' => array(
            'PHP' => array(
                'id' => '2',
                'type_title' => 'Core Questions',
                'type_description' => 'none',
                'type_sort_order' => '7'
                'Post'=>array(
                    ......
                    ),
            ),
            'ASP' => array(
                'id' => '1',
                'type_title' => 'Core Questions',
                'type_description' => 'none',
                'type_sort_order' => '1'
                'Post'=>array(
                    ......
                    ),
            ),
        ),
)));

I have fetched a user with its post categorized by postType
postType has type_sort_order field
I want to sort sub array PostType by type_sort_order field
so that ASP come before PHP
I tried usort as below

usort($arr,function(){
                return  ($a[0]['User']['PostType']['post_sort_order'] < $b[0]['User']['PostType']['post_sort_order'])?1:-1;
            });

and also many other sort but not getting correct result

You need to set the array as $a[0] and sort on that if you want correct results. Then you can just minus value b from value a and it should sort it no problem. If it doesn't sort in the right order try minusing value a from value b. — Harlan Wilton
– Harlan Wilton, Commented Mar 19, 2015 at 8:47

Simon Brahan · Accepted Answer · 2015-03-19 08:58:38Z

1

array_multisort will work. Solution as follows:

$list = //Your array

$sortOrders = array();
foreach ($list[0]['User']['PostType'] as $postType) {
    $sortOrders[] = $postType['type_sort_order'];
}

array_multisort($sortOrders, $list[0]['User']['PostType']);

This will grab all the sort orders in an array ordered the same as your starting array. Using array_multisort on both arrays will sort the first array, and also apply that new order to the second array, giving you the result you're after.

answered Mar 19, 2015 at 8:58

Simon Brahan

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Comments

exussum · Accepted Answer · 2015-03-19 08:45:18Z

0

Your looking for http://php.net/manual/en/function.array-multisort.php

Loop though PostType and take all type_sort_order and place in a seperate array. then use that array as an argument for array_multi_sort

it seems you are just trying to sort the sub array PostType so just pass that array

answered Mar 19, 2015 at 8:45

exussum

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