final class NF_AddonChecker
public function __construct()
add_action( 'plugins_loaded', array( $this, 'check_plugins' ) );
add_action( 'admin_notices', array( $this, 'deactivation_notice' ) );
public function check_plugins()
if ( ! function_exists( 'get_plugins' ) ) {
require_once ABSPATH . 'wp-admin/includes/plugin.php';
$plugins = get_plugins();
foreach( $plugins as $plugin => $data ){
if( 'ninja-forms/ninja-forms.php' != $plugin && 0 === strncmp( $plugin, 'ninja-forms-', 12 ) && version_compare( $data[ 'Version' ], '3', '<' ) ){
if( ! is_plugin_active( $plugin ) ) continue;
deactivate_plugins($plugin);
wp_redirect( admin_url( 'plugins.php?nf-deactivated=' . $plugin ) ); exit;
public function deactivation_notice()
if( ! isset( $_GET[ 'nf-deactivated' ] ) ) return;
$plugin = sanitize_text_field( $_GET[ 'nf-deactivated' ] );
<div class="notice notice-error is-dismissible">
<p><?php echo sprintf( esc_html__( 'Oops! That addon is not yet compatible with Ninja Forms THREE. %sLearn More%s.', 'ninja-forms' ), '<a target="_blank" href="https://ninjaforms.com/ninja-forms-three-extension-development-master-list/">', '</a>' ); ?></p>
<p><?php echo sprintf( esc_html__( '%s was deactivated.', 'ninja-forms' ), '<code>' . $plugin . '</code>'); ?></p>