How to edit JSON objects - php

Question

I'm on PHP and I need to edit a JSON output to return only objects >=0 and divided by one hundred
Eg.
$json = {"data":[0,55,78,-32,-46,37]}
Needed
$json = {"data":[0,0.55,0.78,0.37]}
How this can be done?

Answer 1

Well, I know this is not the best practice, but if it's as simple as this, you can do the following.
$json = '{"data":[0,55,78,-32,-46,37]}';
// decoding the string to objects & arrays
$x = json_decode($json);
// applying a function on each value of the array
$x->data = array_map(
function($a)
{
if( $a >= 0 ) return $a/100;
else return null;
},
$x->data
);
// Removing empty values of the array
$x->data = array_filter($x->data);
// making a JSON array
$jsonData = json_encode(array_values($x->data));
// inserting a JSON array in a JSON Object
$json = '{"data":' . $jsonData . '}';
// here is your {"data":[0,0.55,0.78,0.37]}
echo $json;
Hope it helps !
Btw, I had to trick the json encode with array_values to prevent the creation of an object rather than an array for the data content. But I guess there is a better method that I just don't know ...
EDIT :
Find out the way :D
Once empty values removed from the array, just do :
$x->data = array_values($x->data);
$json = json_encode($x);
This will do the trick and it will not create issues with the rest of the object.

Answer 2

Alessandro:
Here's my approach, feel free to try. json_decode and a simple foreach can help you...
Code:
$json = array();
$result = array();
$json = '{"data":[0,55,78,-32,-46,37]}';
$decoded_json=json_decode($json, TRUE);
foreach ($decoded_json['data'] as &$value) {
if ($value >= 0){
$value = $value / 100;
$result[]=$value;
}
}
echo json_encode($result);
?>
Result:
[0,
0.55,
0.78,
0.37
]