sorting array based on inner-array key-value [duplicate]

Answer 1

Use a custom function and usort:

<?php
function custom_sale_sort($a, $b)
{
    if ($a['total_sales'] < $b['total_sales'])
        return 1;
    elseif ($a['total_sales'] == $b['total_sales'])
        return 0;
    else
        return -1;
}

usort($array, 'custom_sale_sort');

If you need your array sorted in the other direction, then switch the (1,-1) values around in the custom function.

Answer 2

Here is the class you can use to do multidimension sort

Note: You must have PHP5

class MultiDimensionSort
{
    const ASCENDING = 0,DESCENDING = 1;

    public  $sortColumn,$sortType;

    public function __construct($column = 'price', $type = self::ASCENDING)
    {
        $this->column = $column;
        $this->type = $type;
    }

    public function cmp($a, $b)
    {
        switch($this->type)
        {
            case self::ASCENDING:
                return ($a[$this->column] == $b[$this->column]) ? 0 : (($a[$this->column] < $b[$this->column]) ? -1 : 1);
            case self::DESCENDING:
                return ($a[$this->column] == $b[$this->column]) ? 0 :(($a[$this->column] < $b[$this->column]) ? 1 : -1);
            default:
                assert(0); // unkown type
        }
    }
}

Like you have array named summary with contain above array. than you can do sort by following statements. // assuming your array variable is $summary

$s = new MultiDimensionSort('total_sales', MultiDimensionSort::DESCENDING); // sort by total_sales

usort($summary, array($s, 'cmp'));
print"<pre>";print_r($summary);

Cheers! May be this ll help you

Answer 3

PHP 5.3:

usort($array, function ($a, $b) { return $b['total_sales'] - $a['total_sales']; });

PHP 5.2-:

usort($array, create_function('$a,$b', 'return $b["total_sales"] - $a["total_sales"];'));