Question

Ok, so I have this in a JSON array (the output of retrievedData())

{
    "device": {
        "01AA02AB141208VV": {
            "$version": -148598935,
            "$timestamp": 1344382016000,
            "serial_number": "01AA02AB141208VV"
        }
    }
}

However, I can’t seem to select the serial number. I have tried what usually works, but I can’t select it. This is assuming we don’t already know the “01AA02AB141208VV”.

$retrieved_data = retrieveData($array['userid'], $array['urls']['transport_url'], $array['access_token']);
$retrieved_data_array = json_decode($retrieved_data, true);
$serial_number = $retrieved_data_array['device'][0]['serial_number'];

Am I doing something wrong? I bet it’s really simple, but I just cannot figure it out!

Thanks!

Answer 1

you can use key() function to access the keys of the associative array (in this case the ‘$retrieved_data_array[‘device’]’ array:

<?php

$data = '{"device": {"01AA02AB141208VV": {"$version": -148598935,"$timestamp": 1344382016000,"serial_number": "01AA02AB141208VV"}}}';

$retrieved_data_array = json_decode($data, true);
$serial_number = key($retrieved_data_array['device']);
reset($retrieved_data_array['device']);

print_r($serial_number);
print_r($retrieved_data_array['device'][$serial_number]);

?>