php - Reach empty JSON array [duplicate] - php

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How to loop through PHP object with dynamic keys [duplicate]
(16 answers)
Closed 6 years ago.
I use Microsoft Face API and I want to show data to final user, but how can I use foreach to atteint faceAttributes->age ?
There is an example of JSON file
[
{
"faceId": "c5c24a82-6845-4031-9d5d-978df9175426",
"faceRectangle": {
"width": 78,
"height": 78,
"left": 394,
"top": 54
},
"faceAttributes": {
"age": 71.0,
"gender": "male",
"smile": 0.88,
"facialHair": {
"mustache": 0.8,
"beard": 0.1,
"sideburns": 0.02
}
},
"glasses": "sunglasses",
"headPose": {
"roll": 2.1,
"yaw": 3,
"pitch": 0
}
}
}
]
I tried this code but not working :
<?php
$json = file_get_contents('file.json');
$data = json_decode($json);
if (count($data->faceAttributes)) {
// Cycle through the array
foreach ($data->faceAttributes as $idx => $faceAttributes) {
// Output a row
echo $faceAttributes->age ;
echo $faceAttributes->gender ;
?>
Thanks !

Answer 1

You don't have to iterate the object using foreach as the 'age' is a property of $data->faceAttributes itself.
Use this instead
if (count($data->faceAttributes)) {
echo $data->faceAttributes->age;
echo $data->faceAttributes->gender;
}
However, $data is an array and which $data you are using is actually $data[0]
So, if there is only one element in data array you can do
$data = $data[0] or $data = json_decode($json)[0]
Or, you can iterate through $data in case of more then one element.