Advanced Custom Field (ACF) Read Only Field

advanced-custom-field-read-only.txt

/**
 * Advanced Custom Field (ACF) Read Only Field
 * 
 * Use prepare_field to display two fields but keep them read-only for non-admin users
 * 
 * Check for Edit Screen: Non admin users can still add a value to inputs when adding post but 
 * cannot edit the input once created. 
 *
 */

add_filter('acf/prepare_field/name=class_total', 'fka_disable_acf_prepare_field');
add_filter('acf/prepare_field/name=total', 'fka_disable_acf_prepare_field');

function fka_disable_acf_prepare_field( $field ) {

	//Should only happen in WP Admin
	if ( !is_admin() ) 
		return false;

	$screen = get_current_screen();
	
	// When editing a post, the url search filter includes action=edit
	if (isset($_GET['action'] ) ) {
		$action = $_GET['action'];
	} else {
		$action = $screen->action;
	}
	
	// Check to see this applies to our post type in case this field gets added to another CPT. Be sure it's edit screen too.
	if ($screen->post_type == 'fka_registrations' && $action == 'edit' ) {

		// Only admins and fka admins can edit field
		$user = wp_get_current_user();
		$allowed_roles = array('administrator', 'fka_administrator');

		if( array_intersect($allowed_roles, $user->roles ) ) {  
			//Do Nothing
		} else {
			$field['disabled'] = true;
		}

	}