我的csv数据是通过php以错误的格式下载的，当我导出csv数据时会下载我的代码

Question

每当我要下载自己的csv数据时，它都会下载整个代码，而不是以一种很好的形式下载数据，它总是向我输出整个代码，该怎么做，一旦在浏览器中这样显示browser-image，然后下载的文件downloaded-file

我的方法是导入一个首先与y数据库记录匹配的csv数据，然后将输出作为匹配数据提供，现在我想将该匹配数据下载为csv。格式，并以适当的方式（例如行和所有记录）作为标题，但它始终以csv格式下载代码。

$keyword = $_POST['keyword']; $csvname = $_POST['csv_file'];
header("Content-type: text/csv");
header("Content-disposition: attachment; filename = idata.csv");
$output = fopen('php://output', 'w');

// output the column headings
fputcsv($output, array('url', 'id', 'title'));

?>

<table border ="1">
    <thead>
        <tr>
            <th>id</th>
            <th>title</th>
            <th>count</th>
        </tr>
    </thead>

    <?php

    $row = 0;
    if (($handle = fopen("idata.csv", "r",)) !== FALSE)
    {
        while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {

            $num = count($data);
        // echo "<p> $num fields in line $row: <br /></p>\n";
            $row++;
            for ($c=0; $c < $num; $c++) {
            // echo $data[$c] . "<br />\n";
                $query = "SELECT * FROM wm_article WHERE id = '".$data[$c]."'";
                $exec = mysqli_query($conn, $query);
                $details = mysqli_fetch_array($exec);
                $description = $details['title'] ." ".$details['description'];
             //echo $description ;

            //  $regex = "/royal/";

            //  if (preg_match_all($regex, $description, $match))
            //  {

            //      print_r ($matches[0]);
            //  }

                if(preg_match_all("/\b".$keyword."\b/i", $description, $match,PREG_OFFSET_CAPTURE, 3)){
                // echo count(explode('royal', $description));
                // echo "<pre>";print_r($match);

                // echo implode(",", $data)."\n";

                    ?>
                    <tr>
                        <td><?php echo $details['id'];?></td>
                        <td><a href ="<?php echo $details['url'];?>" target ="_blank"><?php echo $details['title'];?></a></td>
                        <td><?php echo count($match[0]); ?></td>

                    </tr>
                    <?php


                }
            }
        }
        fclose($handle);
    }
    ?>

</table>