How to get all the key in multi-dimensional array in php

Question

Array
(
    [0] => Array
        (
            [name] => A
            [id] => 1
            [phone] => 416-23-55
            [Base] => Array
                (
                    [city] => toronto
                )

            [EBase] => Array
                (
                    [city] => North York                
                )

            [Qty] => 1
        )

(
    [1] => Array
        (
            [name] => A
            [id] => 1
            [phone] => 416-53-66
            [Base] => Array
                (
                    [city] => qing
                )

            [EBase] => Array
                (
                    [city] => chong                
                )

            [Qty] => 2
        )

)

How can I get the all the key value with the format "0, name, id, phone, Base, city, Ebase, Qty"?

Thank you!

You will either need to do a Breadth First Search or a Depth First Search to find all the keys in the array. In order to do that easily you will need to use a recursive function. — Cheesebaron, Jun 27 '12 at 21:15
For that exact array `$keys = array_merge(array_keys($array), array_keys(current($array)));` would probably do it. But we could do with knowing exactly what you are trying accomplish by doing this in order to provide advice on the **best** way to do it... — DaveRandom, Jun 27 '12 at 21:16

score 18 · Accepted Answer · edited Mar 08 '16 at 12:16

18

Try this

function array_keys_multi(array $array)
{
    $keys = array();

    foreach ($array as $key => $value) {
        $keys[] = $key;

        if (is_array($value)) {
            $keys = array_merge($keys, array_keys_multi($value));
        }
    }

    return $keys;
}

edited Mar 08 '16 at 12:16

Community

1
1

answered Jun 27 '12 at 21:17

Meliborn

6,495
6
34
53

PHP 5.x would not like that array $array in function call.. FYI instead would have $array = array() or just $array) – Mike Q Jun 02 '18 at 20:08

score 5 · Answer 2 · edited Nov 13 '15 at 16:59

If you don't know what the size of the array is going to be, use a recursive function with a foreach loop that calls itself if each $val is an array. If you do know the size, then just foreach through each dimension and record the keys from each.

Something like this:

<?php
function getKeysMultidimensional(array $array) 
{
    $keys = array();
    foreach($array as $key => $value)
    {
        $keys[] = $key;
        if( is_array($value) ) { 
            $keys = array_merge($keys, getKeysMultidimensional($value));
        }
    }

    return $keys;

}

How to get all the key in multi-dimensional array in php

2 Answers2

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