Auto generated acf-json from Advanced Custom Fields JSON export

auto-acf-json-export.php

/** 
 * Auto generated acf-json from Advanced Custom Fields JSON export
 * How to use:
 * 
 * 1. Export ACF fields to JSON.
 * 2. Rename file "acf-export.json".
 * 3. Place in theme root.
 * 4. Add this script to functions.php, run once. Check scripts are added to acf-json folder (needs write permissions).
 * 5. Remove after successful use!
 */
add_action('init', function() {

    if($json = json_decode(file_get_contents(get_stylesheet_directory() . '/acf-export.json'))) {

        $path = get_stylesheet_directory() . '/acf-json';

        foreach ($json as &$item) {
            $fp = fopen(sprintf('%s/%s.json', $path, $item->key), 'w');
            fwrite($fp, json_encode($item));
            fclose($fp);
        }
    }

});