PHP - add further data inside a specific array key whilst keeping the existing data

Question

If I have an array like this:

$data[0] = ['a' => 'b'];
$data[1] = ['c' => 'd'];
$data[2] = ['e' => 'f'];

How do I add further data inside a specific key of the array whilst keeping the existing data, e.g.

$data[0] = ['a' => 'b'];
$data[1] = ['c' => 'd', 'xx' => 'zz']; // New data has been added here.
$data[2] = ['e' => 'f'];

How do I add things to $data[1] for example?

I've read the following but these don't seem to be the answer:

I've looked at methods like array_combine(), array_push() and array_merge() but cannot seem to do this. Apologies if this is an obvious question but I have tried to look up the things above and can't figure it out.

this one should work, no? stackoverflow.com/questions/3797239/… — Erik Kalkoken
– Erik Kalkoken, Commented Feb 2, 2018 at 15:14
You posted links to some opinions you have found on Stack Overflow. But have you read the documentation? Your problem is described in the "Accessing array elements with square bracket syntax" and "Creating/modifying with square bracket syntax" sections. — axiac
– axiac, Commented Feb 2, 2018 at 15:17
Please post some of your code to see how you are doing it then we can suggest you where it went wrong.. — Pankaj
– Pankaj, Commented Feb 2, 2018 at 15:20

Erik Kalkoken · Accepted Answer · 2018-02-02 15:20:28Z

4

One way to doing it is this:

$data[1]['xx'] = 'zz';

Here is another one:

$data[1] += ['xx' => 'zz'];

edited Feb 2, 2018 at 15:20

answered Feb 2, 2018 at 15:17

Erik Kalkoken

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2 Comments

Andy Over a year ago

Thanks, that works perfectly. For some reason I was looking into array_ methods which are probably not even required.

Erik Kalkoken Over a year ago

Happy to help. If this solved your question, please consider marking as answer to close this question. TY

Arun Kumaresh · Accepted Answer · 2018-02-02 15:24:37Z

0

you can do it by simple foreach just pass array by reference using & in foreach

$data[0] = ['a' => 'b'];
$data[1] = ['c' => 'd'];
$data[2] = ['e' => 'f'];


foreach($data as $k => &$n){

if($k == 1) $n['xx'] = 'zz';

}
print_r($data);

answered Feb 2, 2018 at 15:24

Arun Kumaresh

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