ms_site_check(): true|string

74function ms_site_check() {75 76	/**77	 * Filters checking the status of the current blog.78	 *79	 * @since 3.0.080	 *81	 * @param bool|null $check Whether to skip the blog status check. Default null.82	 */83	$check = apply_filters( 'ms_site_check', null );84	if ( null !== $check ) {85		return true;86	}87 88	// Allow super admins to see blocked sites.89	if ( is_super_admin() ) {90		return true;91	}92 93	$blog = get_site();94 95	if ( '1' === $blog->deleted ) {96		if ( file_exists( WP_CONTENT_DIR . '/blog-deleted.php' ) ) {97			return WP_CONTENT_DIR . '/blog-deleted.php';98		} else {99			wp_die( __( 'This site is no longer available.' ), '', array( 'response' => 410 ) );100		}101	}102 103	if ( '2' === $blog->deleted ) {104		if ( file_exists( WP_CONTENT_DIR . '/blog-inactive.php' ) ) {105			return WP_CONTENT_DIR . '/blog-inactive.php';106		} else {107			$admin_email = str_replace( '@', ' AT ', get_site_option( 'admin_email', 'support@' . get_network()->domain ) );108			wp_die(109				sprintf(110					/* translators: %s: Admin email link. */111					__( 'This site has not been activated yet. If you are having problems activating your site, please contact %s.' ),112					sprintf( '<a href="mailto:%1$s">%1$s</a>', $admin_email )113				)114			);115		}116	}117 118	if ( '1' === $blog->archived || '1' === $blog->spam ) {119		if ( file_exists( WP_CONTENT_DIR . '/blog-suspended.php' ) ) {120			return WP_CONTENT_DIR . '/blog-suspended.php';121		} else {122			wp_die( __( 'This site has been archived or suspended.' ), '', array( 'response' => 410 ) );123		}124	}125 126	return true;127}