In WordPress, if you’re performing a SELECT query using the $wpdb class and the query returns an empty array, it means that the query didn’t return any results. There are a few possible reasons for this:

  1. Incorrect SQL syntax: Make sure the SQL query is correctly formatted and all necessary syntax is in place.
  2. Wrong table name: Ensure that the table name specified in the query is correct and exists in the database.
  3. Incorrect query conditions: Check the WHERE clause of the query to make sure the conditions are correct and relevant to the data you’re trying to retrieve.
  4. Empty database: If the database table you’re querying is empty, the query will return an empty array.
  5. Permission issues: Make sure the user account you’re using to access the database has sufficient permissions to run the query.

If you’re unsure why the query is returning an empty array, you can use the $wpdb->print_error() method to get more information about the error:

bashCopy code$results = $wpdb->get_results( $sql );

if ( ! $results ) {
    echo $wpdb->print_error();
}

This will print an error message to the screen if there was a problem with the query. This can help you diagnose and fix the issue.

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