PHP csv 下载与服务器上的文件副本不同

Question

I'm trying to make a PHP page that queries a database, creates a CSV in the tmp folder then sends that csv to the browser to download, but the file that downloads contain only the last echo in the PHP script, not the file that is stored on the server (that file is saved on the server is perfect).

<?php


$db_host = "localhost"; //can be "localhost" for local development
$db_username = "root";
$db_password = "";
$db_name = "seinventory";
$link = mysqli_connect($db_host,$db_username,$db_password,$db_name) or die(mysqli_error($link));


// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$softwareName = $_GET['soft'];

$result = mysqli_query($link,"SELECT * FROM `seinventory` WHERE software LIKE '%$softwareName%' or apps LIKE '%$softwareName%'");
$timeStamp = date('d.m.Y-h.i.s');
$csvFile = 'C:/xampp/htdocs/tmp/file.csv';
$new_csv = fopen($csvFile, 'w');
$headings = Array('PC Name','Software Name','Software Version');
fputcsv($new_csv, $headings);
while($row = mysqli_fetch_array($result))
{
    $pcName = $row['pcName'];
    $software = $row['software'];
    $app = $row['apps'];
    $softwareArray = explode(";", $software);
    $appArray = explode(";", $app);
    $multiArray = array_merge($softwareArray, $appArray);
    foreach ( $multiArray as $value ) {
        $singleSoftwareArray = explode(":", $value);
        $softwareItem = $singleSoftwareArray[0];
        $pcName = str_replace('.domain.local', '', $pcName);
        if (stripos($softwareItem, $softwareName)  !== false) {
            $singleArray = Array($pcName, $singleSoftwareArray[0], $singleSoftwareArray[1]);
            fputcsv($new_csv, $singleArray);
        }

}
}
fclose($new_csv);

mysqli_close($link);
    // tell the browser it's going to be a csv file
header('Content-Type: application/csv');
    // tell the browser we want to save it instead of displaying it
header('Content-Disposition: attachment; filename="file.csv";');


//unlink($csvFile);
echo "<script>window.close();</script>";

I read somewhere I'm supposed to put exit; after the fclose to stop it writing to the file, but my file on the server is perfect somehow it's being changed during the download process.

Answer 1

You must echo the content of the CSV file to get the correct file. Remove the last echo from your code and replace it with this one.

echo file_get_contents('C:/xampp/htdocs/tmp/file.csv');

As you are storing the file locally you can also redirect the user to a file URL and it should trigger the download. You won't have to pass the content-disposition header if you do it. You have to remove lines providing Content-Type, Content-Disposition header, and last echo statement if you decide to do it this way.

header("Location: tmp/file.csv");

If you are creating the file just temporarily and removing it afterwards then I suggest you should store the data in memory and echo it afterwards.

<?php


$db_host = "localhost"; //can be "localhost" for local development
$db_username = "root";
$db_password = "";
$db_name = "seinventory";
$link = mysqli_connect($db_host,$db_username,$db_password,$db_name) or die(mysqli_error($link));


// Check connection
if (mysqli_connect_errno())
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$softwareName = $_GET['soft'];

$result = mysqli_query($link,"SELECT * FROM `seinventory` WHERE software LIKE '%$softwareName%' or apps LIKE '%$softwareName%'");
$timeStamp = date('d.m.Y-h.i.s');
$new_csv = fopen('php://memory', 'w+');
$headings = Array('PC Name','Software Name','Software Version');
fputcsv($new_csv, $headings);
while($row = mysqli_fetch_array($result))
{
    $pcName = $row['pcName'];
    $software = $row['software'];
    $app = $row['apps'];
    $softwareArray = explode(";", $software);
    $appArray = explode(";", $app);
    $multiArray = array_merge($softwareArray, $appArray);
    foreach ( $multiArray as $value ) {
        $singleSoftwareArray = explode(":", $value);
        $softwareItem = $singleSoftwareArray[0];
        $pcName = str_replace('.domain.local', '', $pcName);
        if (stripos($softwareItem, $softwareName)  !== false) {
            $singleArray = Array($pcName, $singleSoftwareArray[0], $singleSoftwareArray[1]);
            fputcsv($new_csv, $singleArray);
        }

    }
}

mysqli_close($link);
    // tell the browser it's going to be a csv file
header('Content-Type: application/csv');
    // tell the browser we want to save it instead of displaying it
header('Content-Disposition: attachment; filename="file.csv";');

// set the file pointer position back to 0
rewind($new_csv);

// echo all the contents from current file pointer position(In this case from start of the file)
echo stream_get_contents($new_csv);