gistfile1.php

<?php

/**
 * Advanced Custom Fields: Import Export
 *
 * @package   ACF_Import_Export
 * @author    Donald Allen <don@donaldallen.com>
 * @link      http://donaldallen.com
 * @copyright 2013 Donald Allen
 */

class ACF_Import_Export {
    protected           $version                    = '1.0.0';
    protected           $plugin_slug                = 'acf-import-export';
    protected static    $instance                   = null;
    protected           $plugin_screen_hook_suffix  = null;

    private function __construct()
    {
        add_action('admin_menu', array($this, 'add_plugin_admin_menu'));

        // Load admin style sheet and JavaScript.
        add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_styles'));
        add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_scripts'));
    }

    public static function get_instance()
    {
        if (null == self::$instance) {
            self::$instance = new self;
        }

        return self::$instance;
    }

    public static function init()
    {
        global $messages;
        global $acf_data;
        global $choices;

        $acfs = get_posts(array(
            'numberposts'   => -1,
            'post_type'     => 'acf',
            'orderby'       => 'menu_order title',
            'order'         => 'asc',
        ));

        $choices = array();

        if ($acfs) {
            foreach($acfs as $acf) {
                $title = apply_filters( 'the_title', $acf->post_title, $acf->ID );
                $choices[$acf->ID] = $title;
            }
        }

        session_start();

        if (isset($_POST['import'])) {
            self::import();
        }

        if (isset($_POST['export'])) {
            self::export();
        }

        if ($_GET['import_agree']) {
            print_r($_SESSION['acf-import-export']);
        }
    }

    private function import()
    {
        global $messages;
        global $acf_data;

        if (isset($_FILES) && ! empty($_FILES)) {
            if (pathinfo($_FILES['json_file']['name'], PATHINFO_EXTENSION) == 'json') {
                $acf_data = json_decode(file_get_contents($_FILES['json_file']['tmp_name']), true);
            } else {
                $messages['error']['json'] = esc_html('You need to upload a JSON file.');
            }

            if (self::check_json()) {
                $_SESSION['acf-import-export'] = $acf_data;
                $acf_name = $acf_data['wp_posts']['post_title'];

                $messages['success'] = 'You are about to import <strong>' . $acf_name . '</strong>. Are you sure? <a href="' . $_SERVER['REQUEST_URI'] . '&import_agree=yes" class="button">Yes</a> <a href="' . $_SERVER['REQUEST_URI'] . '" class="button">No, I made a terrible mistake!</a>';
            }
        }
    }

    public function export()
    {
        include_once (WP_PLUGIN_DIR . '/advanced-custom-fields/acf.php');

        $acf_posts = $_POST['acf_posts'];

        foreach($acf_posts as $k => $v) {
            $acfs = get_posts(array(
                'numberposts'       => -1,
                'post_type'         => 'acf',
                'orderby'           => 'menu_order title',
                'order'             => 'asc',
                'include'           => array($v),
                'suppress_filters'  => false,
            ));

            foreach ($acfs as $i => $acf) {
                $acf_data = array(
                    'id'            => $acf->post_name,
                    'title'         => $acf->post_title,
                    'fields'        => apply_filters('acf/field_group/get_fields', array(), $acf->ID),
                    'location'      => apply_filters('acf/field_group/get_location', array(), $acf->ID),
                    'options'       => apply_filters('acf/field_group/get_options', array(), $acf->ID),
                    'menu_order'    => $acf->menu_order,
                );

                $acf_data['fields'] = apply_filters('acf/export/clean_fields', $acf_data['fields']);

                print_r($acf_data);
            }
        }
    }

    private function check_json()
    {
        global $messages;

        switch (json_last_error()) {
            case JSON_ERROR_DEPTH:
                $messages['error']['json'] = esc_html('Maximum stack depth exceeded.');
            break;
            case JSON_ERROR_STATE_MISMATCH:
                $messages['error']['json'] = esc_html('Underflow or the modes mismatch.');
            break;
            case JSON_ERROR_CTRL_CHAR:
                $messages['error']['json'] = esc_html('Unexpected control character found.');
            break;
            case JSON_ERROR_SYNTAX:
                $messages['error']['json'] = esc_html('Syntax error, malformed JSON.');
            break;
            case JSON_ERROR_UTF8:
                $messages['error']['json'] = esc_html('Malformed UTF-8 characters, possibly incorrectly encoded.');
            break;
        }

        if ( ! isset($messages['error'])) {
            return true;
        }
    }

    public function enqueue_admin_styles()
    {
        if ( ! isset($this->plugin_screen_hook_suffix)) {
            return;
        }

        $screen = get_current_screen();

        if ($screen->id == $this->plugin_screen_hook_suffix) {
            wp_enqueue_style(
                $this->plugin_slug .'-admin-styles',
                plugins_url('assets/admin/css/admin.css', __FILE__),
                array(),
                $this->version
            );
        }
    }

    public function enqueue_admin_scripts()
    {
        if ( ! isset($this->plugin_screen_hook_suffix)) {
            return;
        }

        $screen = get_current_screen();

        if ($screen->id == $this->plugin_screen_hook_suffix) {
            wp_enqueue_script(
                $this->plugin_slug . '-admin-script',
                plugins_url('assets/admin/js/admin.js', __FILE__),
                array('jquery'),
                $this->version
            );
        }
    }

    public function add_plugin_admin_menu()
    {
        $this->plugin_screen_hook_suffix = add_plugins_page(
            'ACF Import Export',
            'ACF Import Export',
            'read',
            $this->plugin_slug,
            array($this, 'display_plugin_admin_page')
        );
    }

    public function display_plugin_admin_page()
    {
        include_once('views/admin.php');
    }
}