Adding an extra key / value to a PHP array

Question

I have php array that like this:

$categories = array (
    "audio-video" => "Audio & Video",
    "books" => "Books",
    "vehicles" => "Vehicles",
    "watches" => "Watches"
)

How can I add another value to each element in it so it ends up something like this:

$categories = array ( // For example. This isn't the right thing.
    "US01" => "audio-video" => "Audio & Video",
    "US02" => "books" => "Books",
    "US03" => "vehicles" => "Vehicles",
    "US04" => "watches" => "Watches"
)

Is this possible? I'd like to able to access the other values of each element using the first key. So US01 will be Audio & Video or audio-video. Is this possible with php?

"US01" => "audio-video" => "Audio & Video" --- what does this mean? — zerkms
– zerkms, Commented May 20, 2014 at 12:12
array key is always unique, this is looks wrong format you should create another array with same values with another key or use multi level array — Girish
– Girish, Commented May 20, 2014 at 12:16

Cobra_Fast · Accepted Answer · 2014-05-20 12:15:15Z

1

How about

$categories = array(
    "US01" => array("audio-video", "Audio & Video"),
    "US02" => array("books", "Books"),
    "US03" => array("vehicles", "Vehicles"),
    "US04" => array("watches", "Watches")
)

access via

$categories['US01'][0]; // audio-video
$categories['US01'][1]; // Audio & Video

answered May 20, 2014 at 12:15

Cobra_Fast

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2 Comments

jmenezes Over a year ago

Can I run array_key_exists('US01',$categories) on an array like this? Because I need to check if the key exists before I do any more processing. It does work, but I'm asking just to be sure.

Cobra_Fast Over a year ago

@jmenezes Yes, you can.

MrCode · Accepted Answer · 2014-05-20 12:14:46Z

1

You can make an array of arrays:

$categories = array (
    "US01" => array("name" => "Audio & Video", "alias" => "audio-video"),
    "US02" => array("name" => "Books", "alias" => "books"),
);

Then access it like:

echo $categories['US01']['alias']; // audio-video
echo $categories['US01']['name']; // Audio & Video

echo $categories['US02']['alias']; // books
echo $categories['US02']['name']; // Books

answered May 20, 2014 at 12:14

MrCode

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Comments

Joran Den Houting · Accepted Answer · 2014-05-20 12:24:34Z

1

You can not. All you can do is generate a new array inside like this:

$categories = array(
    array(
        "US01",
        "audio-video",
        "Audio & Video"
    ),
    array(
        "US02",
        "books",
        "Books"
    )
);

Or use USxx as a key:

$categories = array(
    "US01" => array(
        "audio-video",
        "Audio & Video"
    ),
    "US02" => array(
        "books",
        "Books"
    ),
);

edited May 20, 2014 at 12:24

answered May 20, 2014 at 12:13

Joran Den Houting

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2 Comments

jmenezes Over a year ago

In you second array, how do I get the values of the array inside? For example, if provide US01 how can I get audio-video or Audio & Video whichever of the two I want? Also, I check for the existence of an array key using array_key_exists('US01',$categories). Is it safe to do so on the second kind of array?

jmenezes Over a year ago

Is echo $categories['US01'][0]; echo $categories['US01'][1]; the way?

webmonkey · Accepted Answer · 2014-05-20 12:15:03Z

0

This should work:

$categories = array (
    "audio-video" => "Audio & Video",
    "books" => "Books",
    "vehicles" => "Vehicles",
    "watches" => "Watches"
);

$newCategories = Array();

$i = 1;
foreach ($categories as $key => $value) {

    $index = "US" . ($i < 10) ? "0" . $i : $i;
    $newCategorys[$index] = Array('slug'=>$categories[$key], 'value'=>$categories[$value]);

    $i++;

}

So you can reach everything with

$newCategories['US01']['slug'] // for "audio-video "

and

$newCategories['US01']['value'] // for "Audio & Video"

(untested)

answered May 20, 2014 at 12:15

webmonkey

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Comments

DaFunkyAlex · Accepted Answer · 2014-05-20 12:15:16Z

0

No, not this way, but could do it this way:

$categories = array (
    "US01" => array("audio-video" => "Audio & Video"),
    "US02" => array("books" => "Books"),
    "US03" => array("vehicles" => "Vehicles"),
    "US04" => array("watches" => "Watches")
)

answered May 20, 2014 at 12:15

DaFunkyAlex

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Comments

Olivier Van Bulck · Accepted Answer · 2014-05-20 12:16:52Z

0

You can use a 2-dimensional array if you want.

$category = array("US01" => array("audio-video" => "Audio & Video"),
    "US02" => array("books" => "Books"),
    "US03" => array("vehicles" => "Vehicles"),
    "US04" => array("watches" => "Watches")
);

answered May 20, 2014 at 12:16

Olivier Van Bulck

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