How to parse json in php from url - php

Question

Im new to json, so i gotta ask you a maybe really simple questions.
I've tried searching around but have not found anything I can get to work.
I have called an API and received the data in json.
And now comes my problem parsing it through my php, it "will not find anything."
My code looks like this:
$opts = array(
'http'=>array(
'method'=>"GET",
'header'=>"Accept: application/vnd.travify.v1+json\r\n"
)
);
$context = stream_context_create($opts);
$url = 'http://oda.ft.dk/api/Sag?$select=titel,Sagskategori/kategori&$expand=Sagskategori';
$output = file_get_contents($url, false, $context);
$string = file_get_contents($url, false, $context);
$result = json_decode($string, true);
$i = -1;
foreach ($result as $data) {
$i++;
echo "#";
echo $i;
echo "<br>";
echo "<b>Test 1:</b>";
echo "<br>";
if(!empty($result[$i]['value']['Sagskategori']['kategori'])){
echo $result[$i]['value']['Sagskategori']['kategori'];
}else{
echo "Intet fundet.";
}
echo "<hr>";
}
The json code can be find here: http://oda.ft.dk/api/Sag?$select=titel,Sagskategori/kategori&$expand=Sagskategori
Can anyone of you see my fail in the code, and get me on the right way :-) ?

Answer 1

Please replace
foreach ($result as $data) {
by
foreach ($result["value"] as $data) {
And now you can iterate to your value array and get all informations from $data
You don't need use $i, $data contains correct $result[$i] value
foreach ($result["value"] as $data) {
echo "#";
echo "<br>";
echo "<b>Test 1:</b>";
echo "<br>";
if(!empty($data['Sagskategori']['kategori'])){
echo $data['Sagskategori']['kategori'];
}else{
echo "Intet fundet.";
}
echo "<hr>";
}

Answer 2

The JSON starts like this:
{
"odata.metadata":"...snip...","value":[
{
So the array is inside the value object.
The correct code should be:
foreach ($result['value'] as $data) {
// snip
if(!empty($result['value'][$i]['Sagskategori']['kategori'])){
echo $result['value'][$i]['Sagskategori']['kategori'];
}
Also, inside the loop, $result['value'][$i]['Sagskategori']['kategori']; is strictly the same as using $data['Sagskategori']['kategori'];.