Resolving Call to undefined function get_results() Error in WordPress Shortcodes

Discover how to fix the `Call to undefined function get_results()` error while creating WordPress shortcodes. Follow our easy guide to optimize your WordPress database queries effortlessly.
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Troubleshooting the Call to undefined function get_results() Error in WordPress

If you’re venturing into WordPress development, encountering errors can be a common hurdle, especially when integrating custom code. One such error is the Call to undefined function get_results(), which stems from an issue with database queries. If you're unfamiliar with PHP or WordPress, this can be particularly frustrating. In this guide, we’ll walk you through understanding this error and provide you with a solution to create a custom shortcode that works seamlessly.

Understanding the Error

The error arises when you try to execute a database query using the function get_results(). In WordPress, this function is part of the $wpdb class, which is used for interacting with the database. If you call get_results() without properly referencing it through $wpdb, it will trigger the error mentioned. This can often happen when you are trying to create custom shortcodes to pull data from the WordPress database.

Example of the Error

Here’s a snippet of code that illustrates the issue:

[[See Video to Reveal this Text or Code Snippet]]

In the code above, the line that causes the problem is where get_results() is called directly, rather than through the global $wpdb. This leads to the undefined function error.

Solution to the Error

The fix for this error is simple: you need to call the get_results() method on the $wpdb object. Here’s how you can modify your code:

Corrected Code

Replace the problematic line in your function with the following:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Fix

Correct Function Call: Use $wpdb->get_results() instead of just get_results(). This is essential because get_results() is a method of the $wpdb class.

Variable Consistency: Ensure that you consistently refer to the retrieved user data. In the loop, change $results to $users to match your earlier variable definition.

Return Value: The return statement encapsulating user names in paragraph tags will allow for better organization and formatting when displayed on the webpage.

Conclusion

Resolving the Call to undefined function get_results() error in WordPress is straightforward once you understand how to interact with the $wpdb class. By following our steps and ensuring proper function calls, you can effectively create shortcodes that pull data effortlessly from your WordPress database. Happy coding!