script to extract large geojson as separated kml file

parse.php

<?php
// exec first: ogr2ogr -f "GeoJSON" -s_srs EPSG:3826 -t_srs EPSG:4326 hello.json 全市潛力基地地籍_20210414.shp
$json = json_decode(file_get_contents(__DIR__ . '/hello.json'), true);
$path = __DIR__ . '/output';
if(!file_exists($path)) {
    mkdir($path, 0777, true);
}
$fc = [];
foreach($json['features'] AS $f) {
    $k = $f['properties']['管理單位'];
    if(!isset($fc[$k])) {
        $fc[$k] = [
            'type' => 'FeatureCollection',
            'name' => $k,
            'features' => [],
        ];
    }
    $fc[$k]['features'][] = $f;
}

foreach($fc AS $k => $j) {
    $targetJson = $path . '/' . $k . '.json';
    $targetFile = $path . '/' . $k . '.kml';
    file_put_contents($targetJson, json_encode($j));
    exec("ogr2ogr -f KML {$targetFile} {$targetJson} -dsco NameField=fid_key");
}