environment_acf_tweaks.php

<?php

namespace DeliciousBrains\Admin;

use DeliciousBrains\DBI;

class ACF {

	public function init() {
		add_filter( 'acf/settings/save_json', array( $this, 'get_local_json_path' ) );
		add_filter( 'acf/settings/load_json', array( $this, 'add_local_json_path' ) );

		if ( ! WP_LOCAL_DEV ) {
			// Only allow fields to be edited on development
			add_filter( 'acf/settings/show_admin', '__return_false' );
		}

		add_action( 'admin_init', array( $this, 'sync_fields_with_json' ) );
	}

	/**
	 * Define where the local JSON is saved
	 *
	 * @return string
	 */
	public function get_local_json_path() {
		return DBI::get_data_dir() . 'acf-json';
	}

	/**
	 * Add our path for the local JSON
	 *
	 * @param array $paths
	 *
	 * @return array
	 */
	public function add_local_json_path( $paths ) {
		$paths[] = DBI::get_data_dir() . 'acf-json';

		return $paths;
	}

	/**
	 * Automatically sync any JSON field configuration.
	 */
	public function sync_fields_with_json() {
		if ( defined( 'DOING_AJAX' ) || defined( 'DOING_CRON' ) ) {
			return;
		}

		if ( ! function_exists( 'acf_get_field_groups' ) ) {
			return;
		}

		$groups = acf_get_field_groups();

		if ( empty( $groups ) ) {
			return;
		}

		$sync = array();

		foreach ( $groups as $group ) {
			$local    = acf_maybe_get( $group, 'local', false );
			$modified = acf_maybe_get( $group, 'modified', 0 );
			$private  = acf_maybe_get( $group, 'private', false );

			if ( $local !== 'json' || $private ) {
				// ignore DB / PHP / private field groups
				continue;
			}

			if ( ! $group['ID'] ) {
				$sync[ $group['key'] ] = $group;
			} elseif ( $modified && $modified > get_post_modified_time( 'U', true, $group['ID'], true ) ) {
				$sync[ $group['key'] ] = $group;
			}
		}

		if ( empty( $sync ) ) {
			return;
		}

		foreach ( $sync as $key => $v ) {
			if ( acf_have_local_fields( $key ) ) {
				$sync[ $key ]['fields'] = acf_get_local_fields( $key );
			}

			acf_import_field_group( $sync[ $key ] );
		}
	}
}