Question

嗨，所有WordPress专家。我想问为什么我会收到错误警告：无法修改标头信息 - 已发送的标头 fputcsv（）正在输出但未写入csv且没有强制下载发生。请帮助我。

 class mycsv{ 

     function generate_csv(){

     global $wpdb;

     $sql = "SELECT * from _mamahota_activity  WHERE activity_date = '2016-08-07' ";
      $MyQuery = $wpdb->get_results($sql);


      $csv_fields=array();
      $csv_fields[] = 'Activity Date';
      $csv_fields[] = 'Name';
      $csv_fields[] = 'Activity Name';
      $csv_fields[] = 'Email Address';
      $csv_fields[] = 'Phone No.';

      $output_handle = fopen( 'php://output', 'w' );

      header('Content-Type: text/csv; charset=utf-8');
      header('Content-Disposition: attachment; filename=data.csv'); 


     foreach ($MyQuery as $Result) {
      $leadArray = (array) $Result; // Cast the Object to an array
      fputcsv( $output_handle, $leadArray );
    }
    exit;
 }
}

Answer 1

我解决了这个问题。我添加了ob_start（）和ob_clean

add ob_start()
 class mycsv{ 

 function generate_csv(){

 global $wpdb;

 $sql = "SELECT * from activity  WHERE activity_date = '2016-08-07' ";
  $MyQuery = $wpdb->get_results($sql);
  ob_clean();
  $csv_fields=array();
  $csv_fields[] = 'Activity Date';
  $csv_fields[] = 'Name';
  $csv_fields[] = 'Activity Name';
  $csv_fields[] = 'Email Address';
  $csv_fields[] = 'Phone No.';

  $output_handle = fopen( 'php://output', 'w' );

  header('Content-Type: text/csv; charset=utf-8');
  header('Content-Disposition: attachment; filename=data.csv'); 


 foreach ($MyQuery as $Result) {
  $leadArray = (array) $Result; // Cast the Object to an array
  fputcsv( $output_handle, $leadArray );
}
exit;
}
}

WordPress导出表获取错误 - 警告：无法修改标头信息 - 已发送的标头

1 个答案: