wpdb::print_error PHP Method

    public function print_error($str = '')
    {
        global $EZSQL_ERROR;
        if (!$str) {
            if ($this->use_mysqli) {
                $str = mysqli_error($this->dbh);
            } else {
                $str = mysql_error($this->dbh);
            }
        }
        $EZSQL_ERROR[] = ['query' => $this->last_query, 'error_str' => $str];
        if ($this->suppress_errors) {
            return false;
        }
        wp_load_translations_early();
        if ($caller = $this->get_caller()) {
            $error_str = sprintf(__('WordPress database error %1$s for query %2$s made by %3$s'), $str, $this->last_query, $caller);
        } else {
            $error_str = sprintf(__('WordPress database error %1$s for query %2$s'), $str, $this->last_query);
        }
        error_log($error_str);
        // Are we showing errors?
        if (!$this->show_errors) {
            return false;
        }
        // If there is an error then take note of it
        if (is_multisite()) {
            $msg = "WordPress database error: [{$str}]\n{$this->last_query}\n";
            if (defined('ERRORLOGFILE')) {
                error_log($msg, 3, ERRORLOGFILE);
            }
            if (defined('DIEONDBERROR')) {
                wp_die($msg);
            }
        } else {
            $str = htmlspecialchars($str, ENT_QUOTES);
            $query = htmlspecialchars($this->last_query, ENT_QUOTES);
            print "<div id='error'>\n\t\t\t<p class='wpdberror'><strong>WordPress database error:</strong> [{$str}]<br />\n\t\t\t<code>{$query}</code></p>\n\t\t\t</div>";
        }
    }