PHP - Download Uploaded Image

Submitted by razormist on Thursday, November 7, 2019 - 12:07.

In this tutorial we will create a Download Uploaded Image using PHP. This code can download an uploaded image when user click the download button. The code use a PHPSELECT query to fetch the image data that will be downloaded, then use PHP header() by adding some content parameter that meet the standard requirement in order to download the image. We will be using PHP as a scripting language and interpreter that is used primarily on any webserver including xamp, wamp, etc. It is being use to any famous websites and it has a modern technology that can easily be use by the next generation.

Getting Started:

First you have to download & install XAMPP or any local server that run PHP scripts. Here's the link for XAMPP server https://www.apachefriends.org/index.html. And, this is the link for the bootstrap that i used for the layout design https://getbootstrap.com/.

Creating Database

Open your database web server then create a database name in it db_image_download, after that click Import then locate the database file inside the folder of the application then click ok. https://www.sourcecodester.com/sites/default/files/2019-11-06_22_26_50-localhost_127.0.0.1_db_image_download_phpmyadmin_4.8.3.png

Creating the database connection

Open your any kind of text editor(notepad++, etc..). Then just copy/paste the code below then name it conn.php.

<?php
        $conn = new mysqli('localhost', 'root', '', 'db_image_download');
        
        if(!$conn){
                die("Error: Failed to connect to database");
        }
?>

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into your text editor, then save it as index.php.

<!DOCTYPE html>
<html lang="en">
        <head>
                <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
                <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
        </head>
<body>
        <nav class="navbar navbar-default">
                <div class="container-fluid">
                        <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
                </div>
        </nav>
        <div class="col-md-3"></div>
        <div class="col-md-6 well">
                <h3 class="text-primary">PHP - Download Uploaded Image</h3>
                <hr style="border-top:1px dotted #000;"/>
                <div class="col-md-4">
                        <form method="POST" action="upload.php" enctype="multipart/form-data">
                                <div class="form-group">        
                                        <input name="file" type="file" required="required"/>
                                </div>  
                                <center><button class="btn btn-primary" name="upload"><span class="glyphicon glyphicon-upload"></span> Upload</button></center>
                        </form>
                </div>
                <div class="col-md-8">
                        <table class="table table-bordered">
                                <thead class="alert-info">
                                        <tr>
                                                <th>Image Name</th>
                                                <th>Action</th>
                                        </tr>
                                <thead>
                                <tbody>
                                        <?php
                                                require 'conn.php';
                                                $query=mysqli_query($conn, "SELECT * FROM `file`") or die(mysqli_error());
                                                while($fetch=mysqli_fetch_array($query)){
                                        ?>
                                                <tr>
                                                        <td><?php echo $fetch['image_name']?></td>
                                                        <td><a href="download.php?image=<?php echo $fetch['location']?>">Download</a></td>
                                                </tr>
                                        <?php
                                                }
                                                
                                        ?>
                                </tbody>
                        </table>
                </div>
        </div>          
</body>
</html>

Creating the Upload Function

This code contains the upload function of the application. This code will store the image data to the database server when the form is submitted. To do this just kindly write these block of codes inside the text editor, then save it as upload.php.

<?php
        require_once 'conn.php';
        
        if(ISSET($_POST['upload'])){
                $file_name = $_FILES['file']['name'];
                $file_temp = $_FILES['file']['tmp_name'];
                $file_size = $_FILES['file']['size'];
                
                $exp = explode(".", $file_name);
                $ext = end($exp);
                $file = time();
                $location = "uploads/".$file.".".$ext;
        
                if($file_size < 5242880){
                        move_uploaded_file($file_temp, $location);
                        mysqli_query($conn, "INSERT INTO `file` VALUES('', '$file', '$location')") or die(mysqli_error());
                        echo "<script>alert('Successfully uploaded!')</script>";
                        echo "<script>window.location='index.php'</script>";
                }else{
                        echo "<script>alert('File too large too upload!')</script>";
                        echo "<script>window.location='index.php'</script>";
                }
        }
?>

Creating the Main Function

This code contains the main function of the application. This code will download the image when the button is clicked. To do this just kindly write these block of codes inside the text editor, then save it as download.php.

<?php
        if(ISSET($_REQUEST['image'])){
                $exp=explode("/", $_REQUEST['image']);
                $image=$exp[1];
                
                header("Cache-Control: public");
                header("Content-Description: File Transfer");
                header("Content-Disposition: attachment; filename=".basename($image));
                header("Content-Type: application/octet-stream;");
                header("Content-Transfer-Encoding: binary");
                readfile("uploads/".$image);
        }
?>

There you have it we successfully created a Download Uploaded Image using PHP. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!