How to sort an array based on a value

Question

$arr['a']['studentname'] = "john";

$arr['b']['studentname'] = "stefen";

$arr['c']['studentname'] = "alex";

is it possible to sort using user defined functions:

usort( $arr )


uasort( $arr )


uksort( $arr )

so based on value which i need to pass, the array should be sorted! expected output:

if the current value then

Array
(
    [c] => Array
        (
            [studentname] => alex

        )

    [a] => Array
        (
            [studentname] => john

        )

    [b] => Array
        (
            [studentname] => stefen

        )

)

if the current value then

 Array
    (

[b] => Array
            (
                [studentname] => stefen

            )
 [a] => Array
            (
                [studentname] => john

            )
        [c] => Array
            (
                [studentname] => alex

            )

    )

thanks in advance

Can you edit with other example, I can get what are you traying to do — Adrian Cid Almaguer
– Adrian Cid Almaguer, Commented Apr 7, 2015 at 3:35

Ilija · Accepted Answer · 2015-04-07 05:50:42Z

1

If I understood the question, you can use a simple string compare callback:

$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";

// A-Z
uasort($arr, function($a, $b) {
  return strcmp($a['studentname'], $b['studentname']);
});

print_r($arr);

// Z-A
uasort($arr, function($a, $b) {
  return strcmp($b['studentname'], $a['studentname']);
});

print_r($arr);

answered Apr 7, 2015 at 5:50

Ilija

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Comments

rumaviio · Accepted Answer · 2015-04-07 06:05:38Z

0

Try this:
For PHP version > 5.3:

$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";

uasort($arr, function($a, $b) {
    return strcmp($a['studentname'], $b['studentname']);
});

For PHP version < 5.3:

$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";

function sort_by($a, $b) {
    return strcmp($a['studentname'], $b['studentname']);
}

uasort($arr, 'sort_by');

edited Apr 7, 2015 at 6:05

answered Apr 7, 2015 at 5:51

rumaviio

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