Reformatting Json to geoJson in PHP (Laravel) - php

Question

I have laravel outputting the following:
[
{
"id": 3,
"lat": "38.8978378",
"lon": "-77.0365123"
},
{
"id": 4,
"lat": "44.8",
"lon": "1.7"
},
{
"id": 22,
"lat": "37.59046",
"lon": "-122.348994"
}
]
i would like it to be the geoJson format:
{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {"type": "Point", "coordinates": [lat, lon]},
"properties": {
"name": "value"
}
}
]
}
I know i need some sort of loop. But i'm not sure how to structure it in PHP. Any guidance would be greatly appreciated. Trying to build a map application that could have several thousand markers on a world view. I'm already thinking about clustering, but need to get past this basic step.
Thanks!

Answer 1

I modified the loop, the arrangement was a bit off. And turned it into a function if anyone is interested:
function geoJson ($locales)
{
$original_data = json_decode($locales, true);
$features = array();
foreach($original_data as $key => $value) {
$features[] = array(
'type' => 'Feature',
'geometry' => array('type' => 'Point', 'coordinates' => array((float)$value['lat'],(float)$value['lon'])),
'properties' => array('name' => $value['name'], 'id' => $value['id']),
);
};
$allfeatures = array('type' => 'FeatureCollection', 'features' => $features);
return json_encode($allfeatures, JSON_PRETTY_PRINT);
}

Answer 2

Just use json_decode() on the original values and rebuild/reconstruct a new one. Consider this example:
$original_json_string = '[{"id": 3,"lat": "38.8978378","lon": "-77.0365123"},{"id": 4,"lat": "44.8","lon": "1.7"},{"id": 22,"lat": "37.59046","lon": "-122.348994"}]';
$original_data = json_decode($original_json_string, true);
$coordinates = array();
foreach($original_data as $key => $value) {
$coordinates[] = array('lat' => $value['lat'], 'lon' => $value['lon']);
}
$new_data = array(
'type' => 'FeatureCollection',
'features' => array(
'type' => 'Feature',
'geometry' => array('type' => 'Point', 'coordinates' => $coordinates),
'properties' => array('name' => 'value'),
),
);
$final_data = json_encode($new_data, JSON_PRETTY_PRINT);
print_r($final_data);
$final_data should yield something like:
{
"type": "FeatureCollection",
"features": {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [
{
"lat": "38.8978378",
"lon": "-77.0365123"
},
{
"lat": "44.8",
"lon": "1.7"
},
{
"lat": "37.59046",
"lon": "-122.348994"
}
]
},
"properties": {
"name": "value"
}
}
}