Simple file uploader

[Jacki]

Hello, today I'm going to explain you how you can make a simple file uploader.

First you have to know that the maximum upload size is definited in the php.ini (upload_max_filesize) of your host, so if you want to upload bigger files you have to change the upload_max_filesize value.

Ok, we're ready to start to write our file uploader:
The most important thing is the form with wich we will send our files to the php code:

<form method=\"post\" action=\"upload.php\" enctype=\"multipart/form-data\">
	File to upload: <input type=\"file\" name=\"file\"> <input type=\"submit\" name=\"submit\" value=\"Upload\"> 
</form>

Now we have to define the maximum size of the file to be uploaded:

define("MAX_FILE_SIZE", 10485760); // Maximum file size is 10 mb, 10485760 is in bytes 

The php files variable that we need are:

$file_name    = $_FILES['file']['name']; // File name
$file_size    = $_FILES['file']['size']; // File size
$file_temp    = $_FILES['file']['tmp_name']; // Our temporaney file
$file_dest    = "files/".basename($file_name); // File destination 

but these will be also useful:

$file_type    = $_FILES['file']['type']; // The file type, if we want to upload a determinated type of file
$file_error = $_FILES['file']['error']; // The files errors 

Now we need the main function with wich we will upload the file (move_uploaded_file):

    if ($file_size <= MAX_FILE_SIZE) {
        // Uploading file
        if(move_uploaded_file($file_temp, $file_dest))
            echo 'File uploaded: '.$file_dest;
        else
            echo 'Error: '.$file_error;
    } else {
        echo "This file is too big!";
    } 

This is the full code:

<?php
define("MAX_FILE_SIZE", 10485760); // Maximum file size is 10 mb, 10485760 is in bytes

if(isset($_POST['submit'])) {
    // Files variables
    $file_name    = $_FILES['file']['name']; // File name
    $file_size    = $_FILES['file']['size']; // File size
    $file_type    = $_FILES['file']['type']; // The file type, if we want to upload a determinated type of file
    $file_temp    = $_FILES['file']['tmp_name']; // Our temporaney file
    $file_error = $_FILES['file']['error']; // The files errors
    $file_dest    = "files/".basename($file_name); // File destination
    
    if ($file_size <= MAX_FILE_SIZE) {
        // Uploading file
        if(move_uploaded_file($file_temp, $file_dest))
            echo 'File uploaded: '.$file_dest;
        else
            echo 'Error: '.$file_error;
    } else {
        echo "This file is too big!";
    }

} else {
    // Uploading form
    echo "<form method=\"post\" action=\"upload.php\" enctype=\"multipart/form-data\">
            File to upload: <input type=\"file\" name=\"file\"> <input type=\"submit\" name=\"submit\" value=\"Upload\"> 
         </form>";
}
?>

I hope as always it will be useful.. Have fun!

Bye!

[Jacki]

Do you have any opinion or suggestion?

[Jordan]

Well done! +rep.
I recommend not using isset to test $_POST values though. I wrote a blog post explaining why here: http://forum.codecall.net/blogs/jord...ing-isset.html

[curiousplayer2003]

Yet another one
» Simple file upload script using php Tutorials, Scripts, Technology and Interview Tips
pretty simple