Warning error on JSON decode - php

Question

I'm getting a warning on a json decode foreach within a foreach (although the code works which is strange) the warning is: Warning: Invalid argument supplied for foreach() it is referring to this line: foreach ($value as $val) {
Here is the JSON response:
Array
(
[ACTION] => avail.datacenters
[DATA] => Array
(
[0] => Array
(
[LOCATION] => Dallas, TX, USA
[DATACENTERID] => 2
[ABBR] => dallas
)
[1] => Array
(
[LOCATION] => Fremont, CA, USA
[DATACENTERID] => 3
[ABBR] => fremont
)
[2] => Array
(
[LOCATION] => Atlanta, GA, USA
[DATACENTERID] => 4
[ABBR] => atlanta
)
[3] => Array
(
[LOCATION] => Newark, NJ, USA
[DATACENTERID] => 6
[ABBR] => newark
)
[4] => Array
(
[LOCATION] => London, England, UK
[DATACENTERID] => 7
[ABBR] => london
)
[5] => Array
(
[LOCATION] => Tokyo, JP
[DATACENTERID] => 8
[ABBR] => tokyo
)
[6] => Array
(
[LOCATION] => Singapore, SG
[DATACENTERID] => 9
[ABBR] => singapore
)
[7] => Array
(
[LOCATION] => Frankfurt, DE
[DATACENTERID] => 10
[ABBR] => frankfurt
)
[8] => Array
(
[LOCATION] => Tokyo 2, JP
[DATACENTERID] => 11
[ABBR] => shinagawa1
)
)
[ERRORARRAY] => Array
(
)
)
My foreach code:
$randDCID = array();
foreach ($linodeRegions as $value) {
foreach ($value as $val) {
echo $val['DATACENTERID'] . "<br />";
$randDCID[] = $val['DATACENTERID'];
}
}
Can anyone see the issue on the warning (although it is outputting the desired results).

Answer 1

The error is probably coming from the ACTION index and the corresponding value(which is string) of the array. Assuming the fact that $linodeRegions in your original array, there's no need to create nested loops in this case, simply use a foreach loop like this:
$randDCID = array();
foreach ($linodeRegions['DATA'] as $value) {
echo $value['DATACENTERID'] . "<br />";
$randDCID[] = $value['DATACENTERID'];
}