PHP fputcsv添加不需要的值

如何解决PHP fputcsv添加不需要的值

到目前为止，我想用fputcsv下载CSV文件，但是它为流文件（在这种情况下为Do.，Re。，Mi.，Fa）添加了额外的值。

如何防止这种情况发生？

感觉好像我在这里遗漏了一些明显的东西。我在Ubuntu机器上使用没有任何框架的纯PHP 7.4。

非常感谢您的帮助！

class CsvDownload
{
    public function downloadFile($data)
    {
        header('Content-Type: text/csv; charset=utf-8');
        header('Content-Disposition: attachment; filename=blizzard.csv');
        $fh1 = @fopen('php://output','w');
        $headerDisplayed = false;
        foreach ($data as $row) {
            // Add a header row if it hasn't been added yet
            if (!$headerDisplayed) {
                // Use the keys from $data as the titles
                fputcsv($fh1,array_keys($row));
                $headerDisplayed = true;
            }
            // Put the data into the stream
            fputcsv($fh1,$row,',');
        }
        // Close the file
        fclose($fh1);
        // Make sure nothing else is sent,our file is done
        exit;
    }

    public function execute()
    {
        //Unwanted
        echo "Do.";
        echo "Re.";
        echo "Mi.";
        echo "Fa.";

        $data = array(
            array('name' => 'A','mail' => '[e-mail]','age' => 43),array('name' => 'C','mail' => '[e-mail]','age' => 24),array('name' => 'B','mail' => '[e-mail]','age' => 35),array('name' => 'G','mail' => '[e-mail]','age' => 22),array('name' => 'F','mail' => '[e-mail]','age' => 52),array('name' => 'D','mail' => '[e-mail]','age' => 32),array('name' => 'E','mail' => '[e-mail]','age' => 34),array('name' => 'K','mail' => '[e-mail]','age' => 18),array('name' => 'L','mail' => '[e-mail]','age' => 25),array('name' => 'H','mail' => '[e-mail]','age' => 28),array('name' => 'J','age' => 53),array('name' => 'I','mail' => '[e-mail]','age' => 26),);
        $this->downloadFile($data);
    }
}

$csvDownload = new CsvDownload();
$csvDownload->execute();

解决方法

我找到了解决问题的方法，在使用fputcsv进行任何操作之前，请先使用ob_end_clean（）清除缓冲区。

这样，以前的所有回声都不会添加到文件中。