Nested Array with Dynamic Key [duplicate]

Question

I have dynamic file which everytime i upload a file, its name depend on filename so jsonobj is example,

How can i echo $obj["FILENAME"] everytime the file change? I need a dynamic code

I try make echo $obj[0]["url"]; But it wont work,

$jsonobj = '{"File.png":{"name":"File.png","url":"www.example.com/File.png"}}';
$obj = (json_decode($jsonobj,true));
echo $obj["File.png"]["url"];

Why do you use the file name as a key if it's dynamic? Are you always going to have just one file inside that JSON? — El_Vanja
– El_Vanja, Commented May 20, 2021 at 9:11
To understand the data structure just do a simple print_r($obj) although as you have converted it to an array it would be better to call that $arr instead of $obj — RiggsFolly
– RiggsFolly, Commented May 20, 2021 at 9:13
A simple echo $obj['File.png']['name']; would work, but as @El_Vanja says, using the filename as the key makes this structure very unhelpful — RiggsFolly
– RiggsFolly, Commented May 20, 2021 at 9:16
Okay i tell u whole process. Im using woocommerce so i need to hook to API, So when i echo my variable such as $jsonobj it will show like that, so i need want to use cURL file, curl file need a url for uploaded image, so that why i to use dynamic. I dont know if got better solution to transfer $jsonobj to new CURLFILE 'Images' => new CURLFILE('www.example.com/File.png'), — Rusydi
– Rusydi, Commented May 20, 2021 at 9:50
Does this answer your question? Get the first element of an array — El_Vanja
– El_Vanja, Commented May 20, 2021 at 9:51

Michel · Accepted Answer · 2021-05-20 09:46:44Z

0

As your filename changes, the first key changes.

So first retrieve that key (File.png), then you can use it to output the content:

reset($obj);       // set pointer to first key
$key = key($obj);  // get first key (File.png)

$url = $obj[ $key ][ 'url' ];

But the comments on how impractical this is, still make sense.

Note As of PHP 7.3.0 you can use array_key_first() instead of reset(); key()

answered May 20, 2021 at 9:46

Michel

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1 Comment

El_Vanja Over a year ago

Why the complication? reset returns the first element, you can work with it directly: 3v4l.org/9XuRA Either way, the question seems a clear duplicate of just getting the first array element.

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