用ksort升序排序

Question

I have the following array:

$optionen_kosten = array(
    "option_5" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_3" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_1" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_6" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_8" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_10" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_2" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_4" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_7" => array(
        'monthly' => 2,
        'setup' => 5
    ),
    "option_9" => array(
        'monthly' => 2,
        'setup' => 5
    )
);

Now, I want to sort the key of that array ascending (option_1, option_2...)

I tried it with ksort but it does not work perfectly:

option_1
option_10
option_2
option_3
option_4
option_5
option_6
option_7
option_8
option_9

I want option_10 to be the last one. Maybe with uksort?

PHP Version: 5.3.3

Answer 1

You want "natural sort" and you can add that to ksort directly (in php 5.4+):

ksort($optionen_kosten, SORT_NATURAL);
var_dump($optionen_kosten);

See the manual on sort() for more details on the optional parameter values.

A working example.

For an older version of php you could use uksort().

That would be something like:

uksort($optionen_kosten, function($a, $b) {
    return strnatcmp($a, $b);
});
var_dump($optionen_kosten);

An example.