Sorting an array by a specific key

Question

In my code below I would like to sort the array $v by its key title, which has only numeric values.

foreach ($archive_years as $key => $value) {
    $id = str_replace(' ', '', $key);
    echo '
        <button type="button" class="btn btn-info collapsible" data-toggle="collapse" data-target="#archiv_'. $id .'"><h3>'. $key .' </h3></button>
        <div id="archiv_'. $id .'" class="collapse">
            <ul>
    ';
    foreach ($value as $k => $v) {
        ksort($v);
        var_dump($v);
        if (get_page($v['id'])->post_content) {
            echo '<li><h4><a href="'. $v["permalink"] .'">'. $v["title"] .' - '. $v["titel"] .'</a></h4></li>';
        }
        else {
            echo '<li><h4>'. $v["title"] .' - '. $v["titel"] .'</h4></li>';
        }

    }
    echo '</ul></div>';
}

I have tried using ksort($v); but that seems not to work in this case.

This is what echo "<pre/>";print_r($v); returns:

Any help would be appreciated!

what is ther in $v? show us for one by doing echo "<pre/>";print_r($v); — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Feb 15, 2017 at 11:24

Philipp · Accepted Answer · 2017-02-15 11:27:49Z

1

You should use usort, if you need your own compare function.

I.e. you could try something like this:

usort($array, function($a, $b) {
    // should work, as title is numeric. to change the direction
    // just change $a and $b
    return $a['title'] - $b['title'];
});

answered Feb 15, 2017 at 11:27

Philipp

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4 Comments

Reza Over a year ago

I have tested your code but for some reason it is not working for me. The array still can't get sorted by title.

artur99 Over a year ago

Shouldn't there be a logical comparison sign instead of the minus? (< or >)

Reza Over a year ago

Thank you, that actually works! I just had to use it for the array $value instead of $v.

Philipp Over a year ago

No, you dont need < or >. The compare function expects a value smaller, greater or equal to zero. Eo just doing the math is sufficient.

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