Simplify a multidimensional array to a string

Question

I have this kind of array in my $tag variable.

Array
(
    [0] => Array
        (
            [tag_name] => tag-1
        )
    [1] => Array
        (
            [tag_name] => tag-2
        )
    [2] => Array
        (
            [tag_name] => tag-3
        )
)

What I'm trying to do is get all the tag names and implode them with a coma then make it a value for a text input field.

I've tried for and foreach loops so many different ways but with not much success. I'm using CodeIgniter if that helps.

`implode(',', array_column($tag, 'tag_name'));;` – splash58 Jul 22 '16 at 08:57 — splash58, Jul 22 '16 at 08:57

Robin Panta · Accepted Answer · 2016-07-23T06:10:19.940

3

You can use array_column followed by join or implode

Try this :

$string = join(',', array_column($array, 'tag_name'));

Explanation:

array_column returns the values from a single column from the input array

For your array, array_column($array 'tag_name') returns an array containing values of index tag_name, i.e returned array would be :

Array
(
    [0] => tag-1
    [1] => tag-2
    [2] => tag-3
)

Joining with join or implode , you get your desired string,

//$string = "tag-1,tag-2,tag-3"

edited Jul 23 '16 at 06:10

answered Jul 22 '16 at 08:57

Robin Panta

224
3
11

Gald to have helped :) – Robin Panta Jul 22 '16 at 09:31
@RobinPanta Can you add some explanation? StackOverflow is useless if people just copy code snippets and learn nothing :P so at least let the asker or other people who visit the question know how this answer works... – Yotam Salmon Jul 22 '16 at 22:35
@YotamSalmon Edited :) happy? :P – Robin Panta Jul 23 '16 at 06:10
@RobinPanta Tbh, Yeah :D Thank you. – Yotam Salmon Jul 23 '16 at 10:51

score 2 · Answer 2 · answered Jul 22 '16 at 08:58

A simple and obvious solution might be:

$res = "";
for ($i = 0; $i < count($tag); $i++) {
    $res .= $tag[$i]["tag_name"] . ",";
}
$res = trim($res, ","); //Removing the extra commas
echo $res;

You basically iterate through the array, and every element you iterate through, you add it's tag_name to a $res string.

score 2 · Answer 3 · answered Jul 22 '16 at 08:59

2

Use array_column

$tag = implode(', ', array_column($array, 'tag_name'));

Using array_map:

$tag = implode(', ', array_map(function ($tag) {
          return $tag['tag_name'];
        }, $array));

answered Jul 22 '16 at 08:59

jitendrapurohit

9,435
2
28
39

score 1 · Answer 4 · answered Jul 22 '16 at 09:05

1

Simple one liner !!

$array = [
    [
        "tag_name" => 'tag-1'
    ],
    [
        "tag_name" => 'tag-2'
    ],
    [
        "tag_name" => 'tag-3'
    ],
];

implode(',', array_column($array, 'tag_name'));

answered Jul 22 '16 at 09:05

Shirraz

172
1
4
10

Simplify a multidimensional array to a string

4 Answers4