Return single column from a multi-dimensional array

Question

I'm a novice at PHP and I need a quick solution to the following problem but can't seem to come up with one:

I have a multi-dimensional array like so

Array
(
    [0] => Array
        (
            [blogTags_id] => 1
            [tag_name] => google
            [inserted_on] => 2013-05-22 09:51:34
            [inserted_by] => 2
        )

    [1] => Array
        (
            [blogTags_id] => 2
            [tag_name] => technology
            [inserted_on] => 2013-05-22 09:51:34
            [inserted_by] => 2
        )
)

I want to use the implode() to somehow return a comma-separated string containing values of tag_name key like so.

google, technology

Is it possible to achieve this effect with the said function? If not then please suggest an alternate solution.

Yoshi · Accepted Answer · 2014-03-24T08:27:35.040

201

Quite simple:

$input = array(
  array(
    'tag_name' => 'google'
  ),
  array(
    'tag_name' => 'technology'
  )
);

echo implode(', ', array_map(function ($entry) {
  return $entry['tag_name'];
}, $input));

http://3v4l.org/ltBZ0

and new in php v5.5.0, array_column:

echo implode(', ', array_column($input, 'tag_name'));

edited Mar 24 '14 at 08:27

answered May 23 '13 at 09:57

Yoshi

54,081
14
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103

4

Note that closures are only supported with PHP 5.3 or above. – Léo Lam Mar 22 '14 at 14:51
2

The solution for >=5.5.0 is perfect! – Key-Six Dec 18 '16 at 01:08
Walking away with >5.5... :) – Vishal Kumar Sahu Feb 18 '17 at 08:15

score 19 · Answer 2 · answered Jan 18 '18 at 23:45

19

Although this question is related to string conversion, I stumbled upon this while wanting an easy way to write arrays to my log files. If you just want the info, and don't care about the exact cleanliness of a string you might consider:

json_encode($array)

answered Jan 18 '18 at 23:45

Msencenb

5,675
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84

I know it seems like a hack, but works like a charm (PHP 5.4 here). ;) – Paulo Bueno Jan 09 '20 at 13:44
6

@PauloBueno in 2020 you really, **really** should not be using PPH 5.4!! – Martin Feb 23 '20 at 19:09

score 10 · Answer 3 · edited Jul 10 '15 at 11:13

10

array_map is a call back function, where you can play with the passed array. this should work.

$str = implode(',', array_map(function($el){ return $el['tag_id']; }, $arr));

edited Jul 10 '15 at 11:13

kamal pal

4,187
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answered Nov 27 '13 at 19:26

Farhan

1,561
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12

score 8 · Answer 4 · answered May 23 '13 at 09:57

8

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

answered May 23 '13 at 09:57

deceze

510,633
85
743
889

score 7 · Answer 5 · answered Oct 17 '15 at 05:41

7

very simple go for this

$str;
foreach ($arrays as $arr) {
$str .= $arr["tag_name"] . ",";
}
$str = trim($str, ',');//removes the final comma

answered Oct 17 '15 at 05:41

Vigneswaran S

2,039
1
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32

score 3 · Answer 6 · answered Aug 25 '17 at 21:35

If you want "tag_name" with associated "blogTags_id" use: (PHP > 5.5)

$blogDatas = array_column($your_multi_dim_array, 'tag_name', 'blogTags_id');
echo implode(', ', array_map(function ($k, $v) { return "$k: $v"; }, array_keys($blogDatas), array_values($blogDatas)));

Atanas Atanasov · Answer 7 · 2018-01-22T22:42:08.220

In this situation implode($array,','); will works, becasue you want the values only. In PHP 5.6 working for me.

If you want to implode the keys and the values in one like :
blogTags_id: 1
tag_name: google

$toImplode=array();
foreach($array as $key => $value) {
$toImplode[]= "$key: $value".'<br>';
}
$imploded=implode('',$toImplode);

Sorry, I understand wrong, becasue the title "Implode data from a multi-dimensional array". Well, my answer still answer it somehow, may help someone, so will not delete it.

Return single column from a multi-dimensional array

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