What is WordPress Hook: set_404

The set_404 hook in WordPress is used to modify the behavior of the 404 error page. It allows developers to customize the content that is displayed when a page is not found on the website.

Understanding the Hook: set_404

The set_404 hook is located within the WordPress template-loader.php file. It is called when WordPress is unable to find the requested page, and it allows developers to override the default 404 error page with their own custom content.

Hook Parameters (if applicable): set_404

The set_404 hook does not accept any parameters.

Hook Doesn’t Work: set_404

If the set_404 hook is not working as expected, it could be due to a conflict with other plugins or themes that are also modifying the 404 error page. To troubleshoot this issue, try disabling other plugins and switching to a default WordPress theme to see if the problem persists.

Best Practices & Usage Notes (if applicable): set_404

When using the set_404 hook, it’s important to keep in mind that any changes made to the 404 error page should provide helpful information to the user and guide them to other relevant content on the website. It’s also a good practice to test the custom 404 error page to ensure that it displays correctly on different devices and screen sizes.

set_404 Usage Example: set_404

“`php
function custom_404_content() {
echo “

Oops! Page Not Found

“;
echo “

Sorry, the page you are looking for does not exist. Please try searching for relevant content or visit our homepage.

“;
}
add_action( ‘set_404’, ‘custom_404_content’ );
“`