Solved

Sorting a multi-dimensional array

Posted on 2013-01-16
4
298 Views
Last Modified: 2013-01-16
Hello,

I have the following array:

Array
(
    [0] => Array
        (
            [0] => 3
            [1] => City0
            [2] => 64
        )

    [1] => Array
        (
            [0] => 6
            [1] => City1
            [2] => 164
        )

    [2] => Array
        (
            [0] => 7
            [1] => City2
            [2] => 160
        )

    [3] => Array
        (
            [0] => 8
            [1] => City3
            [2] => 188
        )

    [4] => Array
        (
            [0] => 9
            [1] => City4
            [2] => 156
        )

    [5] => Array
        (
            [0] => 10
            [1] => City5
            [2] => 72
        )

)

Open in new window


All I need to do is to sort the arrays with the [2] value so that the cities are sorted as:

City3
City1
City2
City4
City5
City0

Is that possible?

Thanks for the help!
0
Comment
Question by:infodigger
  • 2
4 Comments
 
LVL 11

Accepted Solution

by:
Slimshaneey earned 500 total points
ID: 38783252
I use this function for exactly that reason:

private function aasort(&$array, $key) {
        if (is_array($array)) {
            $sorter = array();
            $ret = array();
            reset($array);
            foreach ($array as $ii => $va) {
                $sorter[$ii] = $va[$key];
            }
            arsort($sorter);
            foreach ($sorter as $ii => $va) {
                $ret[$ii] = $array[$ii];
            }
            //Reset array keys to zero base...
            $array = array_values($ret);
            return $array;
        }
    }

Open in new window


In your case the 2 parameters are the array, and 2 as thats the key you want to sort it on
0
 
LVL 34

Expert Comment

by:gr8gonzo
ID: 38783279
<?php

$src = array(
	array(3,"City0",64),
	array(6,"City1",160),
	array(7,"City2",160),
	array(8,"City3",188),
	array(9,"City4",156),
	array(10,"City5",72),
);

$sorted_array = mdarray_sort($src,2,SORT_ASC);
print_r($sorted_array);

function mdarray_sort($srcArray,$sortColumn,$sortDirection = 4)
{
     $arrSortData = array();
     foreach($srcArray as $srcIDX => $srcRow)
          $arrSortData[$srcIDX] = $srcRow[$sortColumn];
     array_multisort($arrSortData,$sortDirection,$srcArray);
     return $srcArray;
}
?>

Open in new window

0
 

Author Closing Comment

by:infodigger
ID: 38783287
Thank you very much for the answer!
0
 
LVL 34

Expert Comment

by:gr8gonzo
ID: 38783290
That example uses array_multisort(), which is the built-in PHP function for doing the bulk of this work and doing it quickly and efficiently. My mdarray_sort function is just a wrapper around it. I've also used this function in the past, which supports multiple sorts (I did not write it, though):

function array_csort() {        //coded by Ichier2003
    $args = func_get_args();
    $marray = array_shift($args); 
    $msortline = 'return(array_multisort(';
    foreach ($args as $arg) {
        $i++;
        if (is_string($arg)) {
            foreach ($marray as $row) {
                $sortarr[$i][] = $row[$arg];
            }
        } else {
            $sortarr[$i] = $arg;
        }
        $msortline .= '$sortarr['.$i.'],';
    }
    $msortline .= '$marray));';
    eval($msortline);
    return $marray;
}

Open in new window

0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Popularity Can Be Measured Sometimes we deal with questions of popularity, and we need a way to collect opinions from our clients.  This article shows a simple teaching example of how we might elect a favorite color by letting our clients vote for …
Introduction This article is intended for those who are new to PHP error handling (https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html).  It addresses one of the most common problems that plague beginning PHP develop…
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn how to count occurrences of each item in an array.

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now