core_auto_updates_settings() WordPress Function

function core_auto_updates_settings() {
	if ( isset( $_GET['core-major-auto-updates-saved'] ) ) {
		if ( 'enabled' === $_GET['core-major-auto-updates-saved'] ) {
			$notice_text = __( 'Automatic updates for all WordPress versions have been enabled. Thank you!' );
			echo '<div class="notice notice-success is-dismissible"><p>' . $notice_text . '</p></div>';
		} elseif ( 'disabled' === $_GET['core-major-auto-updates-saved'] ) {
			$notice_text = __( 'WordPress will only receive automatic security and maintenance releases from now on.' );
			echo '<div class="notice notice-success is-dismissible"><p>' . $notice_text . '</p></div>';
		}
	}

	require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
	$updater = new WP_Automatic_Updater();

	// Defaults:
	$upgrade_dev   = get_site_option( 'auto_update_core_dev', 'enabled' ) === 'enabled';
	$upgrade_minor = get_site_option( 'auto_update_core_minor', 'enabled' ) === 'enabled';
	$upgrade_major = get_site_option( 'auto_update_core_major', 'unset' ) === 'enabled';

	$can_set_update_option = true;
	// WP_AUTO_UPDATE_CORE = true (all), 'beta', 'rc', 'development', 'branch-development', 'minor', false.
	if ( defined( 'WP_AUTO_UPDATE_CORE' ) ) {
		if ( false === WP_AUTO_UPDATE_CORE ) {
			// Defaults to turned off, unless a filter allows it.
			$upgrade_dev   = false;
			$upgrade_minor = false;
			$upgrade_major = false;
		} elseif ( true === WP_AUTO_UPDATE_CORE
			|| in_array( WP_AUTO_UPDATE_CORE, array( 'beta', 'rc', 'development', 'branch-development' ), true )
		) {
			// ALL updates for core.
			$upgrade_dev   = true;
			$upgrade_minor = true;
			$upgrade_major = true;
		} elseif ( 'minor' === WP_AUTO_UPDATE_CORE ) {
			// Only minor updates for core.
			$upgrade_dev   = false;
			$upgrade_minor = true;
			$upgrade_major = false;
		}

		// The UI is overridden by the `WP_AUTO_UPDATE_CORE` constant.
		$can_set_update_option = false;
	}

	if ( $updater->is_disabled() ) {
		$upgrade_dev   = false;
		$upgrade_minor = false;
		$upgrade_major = false;

		/*
		 * The UI is overridden by the `AUTOMATIC_UPDATER_DISABLED` constant
		 * or the `automatic_updater_disabled` filter,
		 * or by `wp_is_file_mod_allowed( 'automatic_updater' )`.
		 * See `WP_Automatic_Updater::is_disabled()`.
		 */
		$can_set_update_option = false;
	}

	// Is the UI overridden by a plugin using the `allow_major_auto_core_updates` filter?
	if ( has_filter( 'allow_major_auto_core_updates' ) ) {
		$can_set_update_option = false;
	}

	/** This filter is documented in wp-admin/includes/class-core-upgrader.php */
	$upgrade_dev = apply_filters( 'allow_dev_auto_core_updates', $upgrade_dev );
	/** This filter is documented in wp-admin/includes/class-core-upgrader.php */
	$upgrade_minor = apply_filters( 'allow_minor_auto_core_updates', $upgrade_minor );
	/** This filter is documented in wp-admin/includes/class-core-upgrader.php */
	$upgrade_major = apply_filters( 'allow_major_auto_core_updates', $upgrade_major );

	$auto_update_settings = array(
		'dev'   => $upgrade_dev,
		'minor' => $upgrade_minor,
		'major' => $upgrade_major,
	);

	if ( $upgrade_major ) {
		$wp_version = get_bloginfo( 'version' );
		$updates    = get_core_updates();

		if ( isset( $updates[0]->version ) && version_compare( $updates[0]->version, $wp_version, '>' ) ) {
			echo '<p>' . wp_get_auto_update_message() . '</p>';
		}
	}

	$action_url = self_admin_url( 'update-core.php?action=core-major-auto-updates-settings' );
	?>

	<p class="auto-update-status">
		<?php

		if ( $updater->is_vcs_checkout( ABSPATH ) ) {
			_e( 'This site appears to be under version control. Automatic updates are disabled.' );
		} elseif ( $upgrade_major ) {
			_e( 'This site is automatically kept up to date with each new version of WordPress.' );

			if ( $can_set_update_option ) {
				echo '<br>';
				printf(
					'<a href="%s" class="core-auto-update-settings-link core-auto-update-settings-link-disable">%s</a>',
					wp_nonce_url( add_query_arg( 'value', 'disable', $action_url ), 'core-major-auto-updates-nonce' ),
					__( 'Switch to automatic updates for maintenance and security releases only.' )
				);
			}
		} elseif ( $upgrade_minor ) {
			_e( 'This site is automatically kept up to date with maintenance and security releases of WordPress only.' );

			if ( $can_set_update_option ) {
				echo '<br>';
				printf(
					'<a href="%s" class="core-auto-update-settings-link core-auto-update-settings-link-enable">%s</a>',
					wp_nonce_url( add_query_arg( 'value', 'enable', $action_url ), 'core-major-auto-updates-nonce' ),
					__( 'Enable automatic updates for all new versions of WordPress.' )
				);
			}
		} else {
			_e( 'This site will not receive automatic updates for new versions of WordPress.' );
		}
		?>
	</p>

	<?php
	/**
	 * Fires after the major core auto-update settings.
	 *
	 * @since 5.6.0
	 *
	 * @param array $auto_update_settings {
	 *     Array of core auto-update settings.
	 *
	 *     @type bool $dev   Whether to enable automatic updates for development versions.
	 *     @type bool $minor Whether to enable minor automatic core updates.
	 *     @type bool $major Whether to enable major automatic core updates.
	 * }
	 */
	do_action( 'after_core_auto_updates_settings', $auto_update_settings );
}