希望这有助于一些:)

<?PHP

class CSVExport
{
/**
* Constructor
*/
public function __construct()
{
if(isset($_GET['download_report']))
{
$csv = $this->generate_csv();

header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate,post-check=0,pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=\"report.csv\";" );
header("Content-Transfer-Encoding: binary");

echo $csv;
exit;
}

// Add extra menu items for admins
add_action('admin_menu',array($this,'admin_menu'));

// Create end-points
add_filter('query_vars','query_vars'));
add_action('parse_request','parse_request'));
}

/**
* Add extra menu items for admins
*/
public function admin_menu()
{
add_menu_page('Download Report','Download Report','manage_options','download_report','download_report'));
}

/**
* Allow for custom query variables
*/
public function query_vars($query_vars)
{
$query_vars[] = 'download_report';
return $query_vars;
}

/**
* Parse the request
*/
public function parse_request(&$wp)
{
if(array_key_exists('download_report',$wp->query_vars))
{
$this->download_report();
exit;
}
}

/**
* Download report
*/
public function download_report()
{
echo '<div class="wrap">';
echo '<div id="icon-tools" class="icon32">
</div>';
echo '<h2>Download Report</h2>';
//$url = site_url();

echo '<p>Export the Subscribers';
}

/**
* Converting data to CSV
*/
public function generate_csv()
{
$csv_output = '';
$table = 'users';

$result = MysqL_query("SHOW COLUMNS FROM ".$table."");

$i = 0;
if (MysqL_num_rows($result) > 0) {
while ($row = MysqL_fetch_assoc($result)) {
$csv_output = $csv_output . $row['Field'].",";
$i++;
}
}
$csv_output .= "\n";

$values = MysqL_query("SELECT * FROM ".$table."");
while ($rowr = MysqL_fetch_row($values)) {
for ($j=0;$j<$i;$j++) {
$csv_output .= $rowr[$j].",";
}
$csv_output .= "\n";
}

return $csv_output;
}
}

// Instantiate a singleton of this plugin
$csvExport = new CSVExport();