You can add a custom column with a value to the returned row object from the $wpdb query in WordPress as follows:

phpCopy codeglobal $wpdb;

$results = $wpdb->get_results( "SELECT * FROM {$wpdb->prefix}table_name WHERE column_name = 'value'" );

foreach ( $results as $result ) {
    $result->custom_column = 'custom value';

In this example, we are using the get_results method of the $wpdb object to run a SELECT query. The get_results method returns an array of row objects, which we can then loop through to add a new column to each row object.

You can then use the custom column in your code as follows:

phpCopy codeforeach ( $results as $result ) {
    echo $result->custom_column;

Note that this will modify the original row object, so it is important to make a copy of the row object if you want to keep the original values intact.

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