Sorting Multi-Dimensional Arrays in PHP 5

Question

First, please excuse me if this is not clear. English is not my first language, though I have tried very hard to make this as intelligible as possible. I am having trouble sorting a multi-dimensional array in PHP. I have reviewed the various array functions on php.net and w3schools, but am still having difficulty.

I have a multi-dimensional array in this form:

    $test_array[$counter]['post_id']
    $test_array[$counter]['votecount']
    $test_array[$counter]['content']

I am trying to sort the array by votecount, so that the post id with the highest votecount is first and then descends from there. I want to get it into a form such as below:

Votes: 10
Post ID:  4
Content: hhgjhg

Votes: 7
Post ID:  26
Content: fhghg

Votes: 6
Post ID:  15
Content: ytryrd

Vivek Goel · Accepted Answer · 2011-02-21 18:28:40Z

1

Use usort function http://php.net/manual/en/function.usort.php

answered Feb 21, 2011 at 18:28

Vivek Goel

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Comments

Neil · Accepted Answer · 2013-02-13 19:30:54Z

0

I know it has something to do with this function call. I am also having the same sort of problem, but I think my code is wrong with my array. Look into this function and maybe it will help you. This is added with your array code when the script is processed.

function compare($x, $y)
{
    if ($x[1] == $y[1])
    {
        retun 0;
    }
        else if ($x[1] < $y[1])
        {
            return -1;
        }
            else
            {
                return 1;
            }
}

uasort($products, 'compare');

answered Feb 13, 2013 at 19:30

Neil

1

Comments

Dilip Vora · Accepted Answer · 2019-03-20 05:43:48Z

0

Try below code

function custom_sorting($a, $b)
{
    if ($a['votecount'] == $b['votecount']) {
        return 0;
    }
    return ($a['votecount'] > $b['votecount']) ? -1 : 1;
}

usort($test_array, "custom_sorting");

answered Mar 20, 2019 at 5:43

Dilip Vora

211 bronze badge

Comments

Dilip Vora · Accepted Answer · 2019-03-20 05:47:26Z

0

Working Example

function custom_sorting($a, $b)
{
    if ($a['votecount'] == $b['votecount']) {
        return 0;
    }
    return ($a['votecount'] > $b['votecount']) ? -1 : 1;
}

 $counter = 0;
 $test_array[$counter]['post_id'] = 1;
 $test_array[$counter]['votecount'] = 15;
 $test_array[$counter]['content'] = "1-15";

 $counter = 1;
 $test_array[$counter]['post_id'] = 2;
 $test_array[$counter]['votecount'] = 18;
 $test_array[$counter]['content'] = "2-18";

  $counter = 2;
 $test_array[$counter]['post_id'] = 3;
 $test_array[$counter]['votecount'] = 10;
 $test_array[$counter]['content'] = "3-10";

usort($test_array, "custom_sorting");

print_r($test_array);

answered Mar 20, 2019 at 5:47

Dilip Vora

211 bronze badge

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