Array_multisort with a variable amount of arrays

[longphant]

Hi,

 

I have a function where I want to sort an an array of this type:

 

0 = {'fruit' => 'banana', 'color' => 'yellow', 'age' => '1', 'weight' => '2', 'brand' => 'dole', 'store' => shaws'}

1 = {'fruit' => 'apple', 'color' => 'red', 'age' => '3', 'weight' => '5', 'brand' => 'fuji', 'store' => 'foodmaster'}

etc etc.

 

I then want to array_multisort this array with different parameters. One way is to sort by fruit, then color, then brand. The second way by age, then store.

 

//This is how I sort it for my first way
//Let's call the array $rows
function sort($rows) {
foreach($rows as $key => $value) {
        $fruit[$key] = $value['fruit'];
$color[$key] = $value['color'];
$brand[$key] = $value['brand'];
    }

    array_multisort($fruit, SORT_ASC, $color, SORT_ASC, $brand, SORT_ASC $rows);
}

 

I want to try to reuse this function by passing in the keys that I want to sort with. Like doing sort($rows, array('fruit', 'color', 'brand')), then sort($rows, array('age', 'store')). Is this possible?

 

       

[Psycho]

Not pretty, but it works:

 

//Class for custom sorting
class customSort
{
    private $sortArray = array();

    function __construct($sortArray)
    {
        $this->sortArray = $sortArray;
    }
   
    function doSort__($a,$b)
    {
        foreach($this->sortArray as $key)
        {
            if ($a[$key] != $b[$key]) { return (($a[$key] > $b[$key]) ? 1 : -1); }
        }
        return 0;
    }
}

## USAGE ##

//Define array sof keys to sort by - in order
$sortKeys = array('color', 'age', 'brand');

//Perform the sorting
usort($inputArray, array(new customSort($sortKeys), "doSort__"));

//Original array is now sorted

[longphant]

This works. Thank you very much!

[kicken]

If you have 5.3 or better and can use closures:

function getCompareFn($keys){
return function($a, $b) use ($keys) {
	foreach ($keys as $k){
		if ($a[$k] < $b[$k]){ return -1; }
		else if ($a[$k] > $b[$k]){ return 1; }
	}

	return 0;
};
}


$arr=array(
array('name' => 'a', 'group' => 'a', 'order' => 2),
array('name' => 'b', 'group' => 'a', 'order' => 1),
array('name' => 'c', 'group' => 'b', 'order' => 5),
array('name' => 'd', 'group' => 'c', 'order' => 3),
array('name' => 'e', 'group' => 'b', 'order' => 4),
array('name' => 'f', 'group' => 'c', 'order' => 6)
);

usort($arr, getCompareFn(array('group', 'order')));

print_r($arr);