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

Question

This question already has answers here:
How can I sort arrays and data in PHP?
(14 answers)
Closed 7 years ago.
I have an array like one mentioned below
Array
(
[6] => Array
(
[name] => Extras
[total_products] => 0
[total_sales] => 0
[total_affiliation] => 0
)
[5] => Array
(
[name] => Office Products
[total_products] => 7
[total_sales] => 17
[total_affiliation] => 8
)
[1] => Array
(
[name] => Hardware Parts
[total_products] => 6
[total_sales] => 0
[total_affiliation] => 0
)
)
Right now, order is: Extras, Office Products, Hardware Parts
I want to sort main array in such as way that it is order by total_sales of inner-array in desc order
so order will be: Office Products, Extras, Hardware Parts
Any help guys

Answer 1

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"];'));

Answer 2

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 3

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