Opening pdf with mysql and php - php

Question

I'm storing pdf's on the filesystem and path in database table. I want now based on the ID to open corresponded PDF document in the browser. How can I open and read PDF's?
What I have so far is this
require_once("database.php");
if(isset($_GET['upload_id']) && is_numeric($_GET['upload_id']))
{
$fileFolder='uploads/';
$sql = "SELECT file FROM documents WHERE upload_id = :id";
$result = $pdo->prepare($sql);
$result->bindParam(":id", $_GET['upload_id']);
$result->execute();
$resArray = $result->fetchAll();
$file = $resArray['file'];
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($fileFolder.$file));
#read($fileFolder.$file);
}
When I click on the button and tried to open the pdf I got this message in the Chrome
Failed to load PDF document
RELOAD

Answer 1

You can get your file name using fetch(PDO::FETCH_ASSOC); which Return next row as an array indexed by column name
$sql = "SELECT file FROM documents WHERE upload_id = :id";
$result = $pdo->prepare($sql);
$result->bindParam(":id", $_GET['upload_id']);
$result->execute();
$resArray = $result->fetch(PDO::FETCH_ASSOC);
$file = $resArray['file'];// get your file name
By using fetchAll
Pass PDO::FETCH_COLUMN, 0
$result = $sth->fetchAll(PDO::FETCH_COLUMN, 0);
$file = $resArray[0];// get your file name

Answer 2

try the following:
require_once("database.php");
if(isset($_GET['upload_id']) && is_numeric($_GET['upload_id']))
{
$fileFolder='uploads/';
$sql = "SELECT file FROM documents WHERE upload_id = :id";
$result = $pdo->prepare($sql);
$result->bindParam(":id", $_GET['upload_id']);
$result->execute();
$resArray = $result->fetchAll();
$file = $resArray['file'];
$myFilePath = $fileFolder . $file;
if (file_exists($myFilePath)) {
// the file exists, so open it
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($fileFolder.$file));
#read($fileFolder.$file);
} else {
// the file doesn´t exits
// handle the error if neccessary
echo "the file doesn´t exist";
}
}