How do I count columns on a custom WPDB query?

Under straight mysql core functions you would use mysql_num_fields, but through $wpdb (wordpress database object), I found the following worked for me.

    $result = $wpdb->get_results('DESCRIBE '.$table,ARRAY_A);
    $columns = array();
    foreach($result as $row) {
        $columns[] = $row['Field'];
    }
    $num_fields = count($columns);

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