CSV导出功能无法在wordpress 4.5.3版上运行

Question

我们在wordpress插件中使用此类型代码创建时间但不起作用。

$data = array(
 '0' => array('Name'=> 'user1', 'Status' =>'complete', 'Priority'=>'Low', 'Salary'=>'001'),
 '1' => array('Name'=> 'user2', 'Status' =>'inprogress', 'Priority'=>'Low', 'Salary'=>'111'),
 '2' => array('Name'=> 'user3', 'Status' =>'hold', 'Priority'=>'Low', 'Salary'=>'333'),
 '3' => array('Name'=> 'user4', 'Status' =>'pending', 'Priority'=>'Low', 'Salary'=>'444'),
 '4' => array('Name'=> 'user5', 'Status' =>'pending', 'Priority'=>'Low', 'Salary'=>'777'),
 '5' => array('Name'=> 'user6', 'Status' =>'pending', 'Priority'=>'Low', 'Salary'=>'777')
);

此类型数组管理然后

$filename = "exportpin".time().".csv";
$fp = fopen('php://output', 'w');
$header = array('name','Status', 'Priority','Salary');
header('Content-type: application/csv');
header('Content-Disposition: attachment; filename='.$filename);
fputcsv($fp, $header);

foreach($item_array as $datas) {
    fputcsv($fp, $datas);
}
exit;

此类型错误获取

Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\pinrotate\wp-includes\formatting.php:4596)