Sorting PHP array(s) based on their initial keys?

Question

I want to sort my initial array(s) that contain many keys and values inside, into array(s) sorted by a specific key, and all the values for that key in a single array based on the key.

So here's the array I have:

$Before = Array(Array("id" => 1, "name" => "Dogs"), 
                Array("id" => 2, "name" => "Lions"), 
                Array("id" => 3, "name" => "Tigers"));

And this is the array that I would like to end up with:

$After = Array("ids"   => Array(1, 2, 3), 
               "names" => Array("Dogs", "Lions", "Tigers"));

I hope that makes sense. I found it easier to show you an example, as oppose to describing it.

If you did need it sorted as well as restructured, could try using the code in example #3 of php.net/manual/en/function.array-multisort.php — Pudge601
– Pudge601, Commented Jun 3, 2013 at 11:48

BlitZ · Accepted Answer · 2013-06-03 11:52:48Z

2

$after = array(
    'ids'   => array(),
    'names' => array()
);

foreach($before as $row){
    $after['ids'][]   = $row['id'];
    $after['names'][] = $row['name'];
}

var_dump($after);

edited Jun 3, 2013 at 11:52

answered Jun 3, 2013 at 11:46

BlitZ

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Baba · Accepted Answer · 2013-06-03 11:49:18Z

2

You can use array_reduce

$After = array_reduce($Before, function ($a, $b) {
    $a['ids'][] = $b['id'];
    $a['names'][] = $b['name'];
    return $a;
});

Live DEMO

answered Jun 3, 2013 at 11:49

Baba

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Comments

Logarytm Całkowy · Accepted Answer · 2013-06-03 11:47:26Z

0

Maybe something like:

foreach ($input as $item) {
    foreach ($item as $field => $value) {
        $result[$field][] = $value;
    }
}
    var_dump($result);

answered Jun 3, 2013 at 11:47

Logarytm Całkowy

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Markus Schindler · Accepted Answer · 2013-06-03 11:51:12Z

0

$After = array();
foreach ($Before as $a) {
    $After['ids'][] = $a['id'];
    $After['names'][] = $a['name'];
}

This should work :)

answered Jun 3, 2013 at 11:51

Markus Schindler

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