CODEWITHSUNDEEP
phparraysjson
Devin
Devin

Reputation: 2246

Select value out of array in PHP

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!

Upvotes: 1

Views: 97

Answers (3)

Matthew Blancarte
Matthew Blancarte

Reputation: 8301

This will grab the serial numbers, assuming you have multiple items in the devices array:

$keys = array();

foreach( $retrieved_data_array['device'] as $key => $val ){
  $keys[] = $key;
}

$serial = $keys[0];

This can be reduced if you know you only have one item in the array...

Upvotes: 1

Software Guy
Software Guy

Reputation: 3280

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]);

?>

Upvotes: 3

SomeKittens
SomeKittens

Reputation: 39522

Unfortunately, it's not really simple. You're trying to find 42 Main St. when you don't know the city Main St. is located in. The only way to find the serial_number would be to loop over $retrieved_data_array with foreach until you find the value you want.

Upvotes: 4

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