Article Diary - General Knowledge Digest

File Upload in PHP - PHP File Upload Script

This script will help you lean how to upload files with PHP. PHP is undoubtedly the best programming language when it comes to web programming. It gives us so many features and capabilities, a few of which we’ve discussed already. So continuing with that, today we will see how we can use a few lines of PHP code to create a File Upload Script that would allow file uploading right from the web browser. File upload feature is definitely useful kinds of website but at the same time very much vulnerable to malicious attacks as well. So use it with a lot of precautions!


For this example, we will need a front-end web page (upload.html) that’ll accept the file from the user and a backend PHP file upload script (file-upload.php) to process and store the file. Let us look at the codes of each file.

enctype="multipart/form-data">


Here we have a HTML form that calls the script on submission. The method of data sending should be “POST” and there should be and enctype as “multipart/form-data” which means we can upload binary form data. The input type “file” opens the File Input Box that’d let the user browse for the file. The submit button “Upload” submits the form as usual.

PHP File Upload Script (file-upload.php)

if ($_FILES["file"]["error"] > 0)
{
echo "Error:: " . $_FILES["file"]["error"] . "
";
}
else
{
if (file_exists($_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"], $_FILES["file"]["name"]);
echo "File " . $_FILES["file"]["name"] . " uploaded successfully!";
}
}
?>

Just like we had POST form data in $_POST[] and GET data in $_GET[] array same way to have files sent to script we use $_FILES[] array.
  1. $_FILES["file"]["error"]: Tells us if there is any error in uploading. Note that “file” the first string index of the array is the name of the “File” input type from the HTML form.
  2. $_FILES["file"]["tmp_name"]: All the files sent to any script is stores in a temporary directory by PHP, this tells us the location of that temporary file.
  3. $_FILES["file"]["name"]: It tells us the name of the file on the users’ computer.
move_uploaded_file(): As files sent to scripts are just stored temporarily, we have to save it to some place, for this we use this PHP function. It’s first parameter is the temporary file location and second is the place we need to store the file and with what name. We are storing it to the same directory the script is in and with name same as on the users’ computer.

NOTE: This is just meant for example purpose and you shouldn’t have this on your server as it is an open invitation to hackers/spammers. If you need upload facility on your website in all the cases you should have some kind of authentication system that’d only allow registered users to upload anything. you should also accept only certain file types. you wouldn’t like someone uploading/running spamming script off your server. Would you? there may be a few other precautions that you may need to take depending on the purpose you intend to use the script for.
Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Security Code Security Code
Related Articles RSS Feed
Stylish Cross-Browser CSS Buttons - Simply-Buttons v2
Viewed 701 times since Thu, Nov 12, 2009
PHP Quiz Questions and Answers
Viewed 2056 times since Mon, Jan 11, 2010
AeroSQL - Web Based MySQL Management
Viewed 743 times since Wed, Feb 24, 2010
Tiny Flash MP3 Audio Player
Viewed 665 times since Wed, Jan 6, 2010
dygraphs JS Charts - Free JavaScript Charts
Viewed 655 times since Sun, Dec 13, 2009
Before and After Picture - jQuery Plugin
Viewed 927 times since Tue, Dec 29, 2009
8 Basics of Regular Expressions
Viewed 705 times since Mon, Mar 8, 2010
dTree - Flexible JavaScript Tree Menu
Viewed 1063 times since Thu, Jan 14, 2010
Use PHP Functions In JavaScript with PHP.JS Library
Viewed 623 times since Fri, Jan 8, 2010
10 Tips for Writing Better CSS Code
Viewed 780 times since Fri, Nov 27, 2009
MENU