updates.php

<?php

/**
 * Disable notifications about updates.
 */

// Core update notifications
add_filter( 'pre_site_transient_update_core', 'last_checked_now' );

// Plugin update notifications
add_filter( 'pre_site_transient_update_plugins', 'last_checked_now' );

// Theme update notifications
add_filter( 'pre_site_transient_update_themes', 'last_checked_now' );

// Core translation notifications
add_filter( 'site_transient_update_core', 'remove_translations' );

// Plugin translation notifications
add_filter( 'site_transient_update_plugins', 'remove_translations' );

// Theme translation notifications
add_filter( 'site_transient_update_themes', 'remove_translations' );

function last_checked_now() {
	include ABSPATH . WPINC . '/version.php';
	$current                  = new stdClass();
	$current->updates         = array();
	$current->version_checked = $wp_version;
	$current->last_checked    = time();

	return $current;
}

function remove_translations( $transient ) {
	if ( is_object( $transient ) && isset( $transient->translations ) ) {
		$transient->translations = array();
	}

	return $transient;
}


/**
 * Remove actions that checks for updates
 */
add_action(
	'admin_init',
	function () {
		remove_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' );
		remove_action( 'admin_init', 'wp_maybe_auto_update' );
		remove_action( 'admin_init', 'wp_auto_update_core' );
		wp_clear_scheduled_hook( 'wp_maybe_auto_update' );
	}
);


/**
 * Disable automatic core updates
 */
add_filter( 'automatic_updater_disabled', '__return_true' );
add_filter( 'allow_minor_auto_core_updates', '__return_false' );
add_filter( 'allow_major_auto_core_updates', '__return_false' );
add_filter( 'allow_dev_auto_core_updates', '__return_false' );
add_filter( 'auto_update_core', '__return_false' );
add_filter( 'wp_auto_update_core', '__return_false' );
add_filter( 'auto_core_update_send_email', '__return_false' );
add_filter( 'send_core_update_notification_email', '__return_false' );
add_filter( 'automatic_updates_send_debug_email', '__return_false' );
add_filter( 'automatic_updates_is_vcs_checkout', '__return_true' );


/**
 * Disable automatic plugin updates
 */
add_filter( 'auto_update_plugin', '__return_false' );


/**
 * Disable automatic theme updates
 */
add_filter( 'auto_update_theme', '__return_false' );


/**
 * Disable automatic translation updates
 */
add_filter( 'auto_update_translation', '__return_false' );