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✏️ Editing: class-acf-ajax-upgrade.php

<?php

if( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

if( ! class_exists('ACF_Ajax_Upgrade') ) :

class ACF_Ajax_Upgrade extends ACF_Ajax {
	
	/** @var string The AJAX action name */
	var $action = 'acf/ajax/upgrade';
	
	/**
	 * get_response
	 *
	 * Returns the response data to sent back.
	 *
	 * @date	31/7/18
	 * @since	5.7.2
	 *
	 * @param	array $request The request args.
	 * @return	mixed The response data or WP_Error.
	 */
	function get_response( $request ) {
		
		// Switch blog.
		if( isset($request['blog_id']) ) {
			switch_to_blog( $request['blog_id'] );
		}
		
		// Bail early if no upgrade avaiable.
		if( !acf_has_upgrade() ) {
			return new WP_Error( 'upgrade_error', __('No updates available.', 'acf') );
		}
		
		// Listen for output.
		ob_start();
		
		// Run upgrades.
		acf_upgrade_all();
		
		// Store output.
		$error = ob_get_clean();
		
		// Return error or success.
		if( $error ) {
			return new WP_Error( 'upgrade_error', $error );
		}
		return true;
	}
}

acf_new_instance('ACF_Ajax_Upgrade');

endif; // class_exists check

MR SKB