将MySQL表导出到CSV文件不起作用

Question

I got the output printed in the browser,while i need to download it as CSV file. Below is my code

$output        = "";
$table         = ""; // Enter Your Table Name 
$sql           = mysql_query("select * from $table");
$columns_total = mysql_num_fields($sql);

while ($row = mysql_fetch_array($sql)) {
  for ($i = 1; $i < $columns_total-1; $i++) {
    $output .='"'.$row["$i"].'",';
  }
  $output .="\n";
}

// Download the file

$filename = "myFile.csv";
header('Content-type: application/csv');
header('Content-Disposition: attachment; filename='.$filename);
echo $output;
exit;

Answer 1

Why are you generating the CSV file manually? There is a built in function for that; fputcsv .

<?php

// generate csv
$table = 'my_table';
$output_file = 'file.csv';
$delimiter = ',';
$enclosure = '"';
$h = fopen($output_file, 'w');
$sql = mysql_query("select * from $table");
while ($row = mysql_fetch_assoc($sql)) {
    fputcsv($h, $row, $delimiter, $enclosure);
}
fclose($h);

// force download csv
header("Content-type: application/force-download"); 
header('Content-Disposition: inline; filename="'. $output_file .'"'); 
header("Content-Transfer-Encoding: Binary"); 
header("Content-length: ". filesize($output_file)); 
header('Content-Type: application/excel'); 
header('Content-Disposition: attachment; filename="'. $output_file .'"');

?>

ps If you require the table column in the csv as headers, you can do this instead when generating the csv file:

// generate csv
$table = 'my_table';
$output_file = 'file.csv';
$delimiter = ',';
$enclosure = '"';
$h = fopen($output_file, 'w');
$sql = mysql_query("select * from $table");
$header_written = false;
while ($row = mysql_fetch_assoc($sql))
{
    if (!$header_written) {
        fputcsv($h, array_keys($row), $delimiter, $enclosure);    
        $header_written = true;
    }
    fputcsv($h, $row, $delimiter, $enclosure);
}
fclose($h);

Answer 2

Use this function

    function force_download($file)
    {
        $dir = ""; // directory path if any
        if ((isset($file))&&(file_exists($dir.$file))) 
        {
           header("Content-type: application/force-download");
           header('Content-Disposition: inline; filename="' . $dir.$file . '"');
           header("Content-Transfer-Encoding: Binary");
           header("Content-length: ".filesize($dir.$file));
           header('Content-Type: application/octet-stream');
           header('Content-Disposition: attachment; filename="' . $file . '"');
           readfile("$dir$file");
        }
    }//end function

    $filename = "myFile.csv";
    force_download($filename);

Answer 3

I had this problem as well, no matter what combination of "header" I used.

The solution for me was because I had some HTML in my "download.php" file. I guess if the browser detects any HTML, it will display the data in the browser instead of initializing the download.

Delete any HTML in your "download.php" file and leave only PHP--- it should work.