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Seaweed-Focused Diet Shown to Decrease Gastrointestinal Inflammation in Fish, Research Reveals

Grasping the WordPress Error: include_once Failed for sunrise.php

While administering a WordPress site, mainly within a multisite environment, facing warning alerts concerning absent files can hinder your tasks or lead to noticeable issues for your visitors. A frequently encountered error is:

Warning: include_once(/home/u801461719/domains/scienceblog.com/public_html/wp-content/sunrise.php): 
Failed to open stream: No such file or directory in 
/home/u801461719/domains/scienceblog.com/public_html/wp-includes/ms-settings.php on line 47

Warning: include_once(): Failed opening 
'/home/u801461719/domains/scienceblog.com/public_html/wp-content/sunrise.php' for inclusion 
(include_path='.:/opt/alt/php82/usr/share/pear:/opt/alt/php82/usr/share/php:/usr/share/pear:/usr/share/php') 
in /home/u801461719/domains/scienceblog.com/public_html/wp-includes/ms-settings.php on line 47

This warning typically appears when WordPress tries to access the sunrise.php file but cannot find it. Let’s explore what this file entails, the reasons for the error, and how to fix it.

What Is sunrise.php?

Within the realm of WordPress multisite setups, sunrise.php is an optional and advanced configuration file. It’s often utilized by domain mapping plugins or other multisite utilities to intercept and handle rewrite rules prior to the complete loading of the core WordPress settings.

This file is usually located in the wp-content directory and is loaded early by the ms-settings.php script provided that these criteria are met:

  1. The SUNRISE constant is defined and set to 'on' or true in wp-config.php.
  2. The wp-content/sunrise.php file is present and accessible.

Why This Error Occurs

The warnings displayed suggest that WordPress is attempting to include the sunrise.php file, yet it is unavailable. This usually occurs for one of the following reasons:

  • File deleted or missing: The sunrise.php file may have been unintentionally deleted or never created.
  • Faulty plugin installation: Plugins that depend on sunrise.php, like domain mapping plugins, may not have installed the file correctly.
  • Configuration issues in wp-config.php: Having define('SUNRISE', 'on'); in place without the corresponding file triggers this alert.
  • Migration or update complications: If the site underwent migration or a plugin was updated improperly, essential files like sunrise.php might not have been transferred.

How to Fix This Problem

To address this warning, take the following steps:

Step 1: Verify the Configuration

Open your wp-config.php file and search for this line:

define('SUNRISE', 'on');

If this line is present, WordPress multisite functionality will search for the sunrise.php file.

Step 2: Inspect for the File

Go to the wp-content directory within your WordPress setup and check if sunrise.php is available.

  • If it is present, ensure it has the proper permissions (usually 644).
  • If it is not present, you can either:
    • Download or retrieve it from a functioning backup if available.
    • Reinstall the plugin that requires it (such as a domain mapping plugin).
    • Remove or comment out (//) the define('SUNRISE', 'on'); line in wp-config.php if you are not actively using domain mapping or don’t need sunrise.php.

Step 3: Restore Missing sunrise.php (if needed)

If the file is essential (for example, for domain mapping functionality), you need to recover or place the appropriate sunrise.php file in your wp-content directory. For instance, if you are using