您应该在数组中构建列架构。然后将其添加到csv的顶部，然后您可以添加csv的内容。

$string_headers = \'post_title,post_author,etc....\';

if(count($results) > 0)
{
    $result = $string_header;
    foreach($results as $result){
    $tmp_result = array_values($result);
    $result .= implode(", ", $tmp_result);
    $csv_output .= $result."\\n";
}

我能够做到这一点，首先获取列名，然后将其分配给最终输出：

  $table_name = $wpdb->prefix.$_POST["table_name"];// table name
                       $file = \'database_csv\'; // csv file name
                       $results = $wpdb->get_results("SELECT * FROM $table_name",ARRAY_A );

                        // get column names
                        $query = "SELECT `COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_SCHEMA`=\'".$wpdb->dbname."\' AND `TABLE_NAME`=\'".$table_name."\'";

                        $columnNamesList = $wpdb->get_results($query);  


                        foreach ( $columnNamesList as $column_name ) {
                            $csv_output.=$column_name->COLUMN_NAME.",";
                        }


                        // remove last additional comma 
                        $csv_output = substr($csv_output,0,strlen($csv_output)-1);

                        // start dumping csv rows in new line
                        $csv_output.="\\n";

                       if(count($results) > 0){
                          foreach($results as $result){
                          $result = array_values($result);
                          $result = implode(", ", $result);
                          $csv_output .= $result."\\n";
                        }
                      }

                      $filename = $file."_".date("Y-m-d_H-i",time());
                      header("Content-type: application/vnd.ms-excel");
                      header("Content-disposition: csv" . date("Y-m-d") . ".csv");
                      header( "Content-disposition: filename=".$filename.".csv");
                      header("Pragma: no-cache");
                      header("Expires: 0");
                      print $csv_output;
                      exit;