How can I sort one array depending on another array?

Question

I have two arrays stored in an array. They have the same number of values and are aligned:

$matrix['label1']
$matrix['label2']

I want to apply alphabetical sorting to $matrix['label1'] and move the contents of $matrix['label1'] in the same pattern. Here is an example of input and output.

$matrix['label1'] = ['b','c','a']
$matrix['label2'] = [ 1, 2, 3]

asort($matrix['label1'])
// outputs ['a','b','c']
//$matrix['label2'] should now be depending on that [ 3, 1, 2]

How can I change my asort() call to get this to work?

Please make a little example from your input and your expected output — Rizier123
– Rizier123, Commented Jun 10, 2015 at 19:50

Rizier123 · Accepted Answer · 2015-06-10 20:01:37Z

4

You are looking for array_multisort(), just pass both subArrays as arguments to it:

<?php

    $matrix['label1'] = ['b','c','a'];
    $matrix['label2'] = [ 1, 2, 3];

    array_multisort($matrix['label1'], $matrix['label2']);
    print_r($matrix);

?>

output:

Array
(
    [label1] => Array
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [label2] => Array
        (
            [0] => 3
            [1] => 1
            [2] => 2
        )

)

answered Jun 10, 2015 at 20:01

Rizier123

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4 Comments

Emanegux Over a year ago

how could I apply this is a collection of arrays?

Rizier123 Over a year ago

@Emanegux What do you mean with this? If you have multiple arrays?

Emanegux Over a year ago

If I have $matrix['label3'] and $matrix['label4'] and so on and wanted them to be sorted in the same way $matrix['label2'] was sorted

Rizier123 Over a year ago

@Emanegux Just use call_user_func_array() and pass all sub-Arrays as arguments by reference, e.g. call_user_func_array("array_multisort", [&$matrix["label1"], &$matrix["label2"], &$matrix["label3"], ...]);

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