Create zip archive out of file from MySQL using PHP - php

Question

I am trying to put a XML file from MySQL database to a zip archive before downloading. I am able to create zip file but Windows is giving error while opening it.
error msg: window cannot open the foler.
filename.zip is invalid
Here is my code:
<?php
if(isset($_GET['id']))
{
$id = intval($_GET['id']);
if($id <= 0) {
die('The id is invalid!');
}
else
{
// Connect to the database
$dbLink = new mysqli('localhost', 'root', 'root', 'db');
if(mysqli_connect_errno()) {
die("MySQL connection failed: ". mysqli_connect_error());
}
$zip = new ZipArchive();
$filename = "export_".date('Y.m.d H.i').".zip";
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE) !== true)
{
echo "Cannot Open for writing";
}
$zip->addEmptyDir('Section');
$query = "SELECT name,data FROM file_section WHERE id ='$id'";
$result = $dbLink->query($query);
if($result->num_rows == 1)
{
// Get the row
$row = mysqli_fetch_array($result);
}
while($row = mysql_fetch_array($result))
{
$zip->addFile($row['data'], "{$row['name']}.xml");
}
$zip->close();
header("Content-disposition: attachment; filename='.$filename'");
header('Content-type: application/zip');
readfile($fileName);
}
// Free the mysqli resources
mysqli_free_result($result);
}
else {
echo "Error! Query failed: <pre>{$dbLink->error}</pre>";
}
mysqli_close($dbLink);
?>
P.S.: I have limited PHP knowledge.

Answer 1

Test this : create a temp file before addFile your zip object
see http://php.net/manual/en/ziparchive.addfile.php
addFile method wait first parameter a filename (the path to the file to add)

Answer 2

Here is the working solution that I got later. Its valid for one single file id input.
<?php
// Make sure an id was passed
if (isset($_GET['ids'])) {
// Get the id into string (in case of an array)
$id_pass = implode(",",$_GET['ids']);
// Make sure the name is in fact a valid
if ($id_pass <= 0) {
die ('No ID Selected!');
} else
{
// Connect to the database
$dbLink = new mysqli('localhost', 'root', 'password', 'DB Name');
if (mysqli_connect_errno()) {
die("MySQL connection failed: " . mysqli_connect_error());
}
// Fetch the file information
$query = "select id, name, data from datatable where id = {$id_pass};";
$result = $dbLink->query($query);
if ($result) {
// Make sure the result is valid
if ($result->num_rows == 1) {
// Get the row
$row = mysqli_fetch_assoc($result);
//zip function
$zip = new ZipArchive();
$filename = "export_" . date('Y.m.d H.i.s') . ".zip";
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE) !== true) {
echo "Cannot Open for writing";
}
$ext = $row['name'] . ".xml"; // taking file name from DB and adding extension separately
$zip->addFromString($ext, $row['data']); //adding blob data from DB
$zip->close();
header("Content-disposition: inline; filename='.$filename'");
header('Content-type: application/zip');
readfile($filename);
unlink($filename);
}
}
// Free the mysqli resources
mysqli_free_result($result);
mysqli_close($dbLink);
}
}