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if(isset($_POST['submit'])) {
	// If action is add. 
	if($_POST['action'] == 'add') {
		// Define the folder where the file will be uploaded.
		$upload_path = './uploads/' . $_FILES['file']['name'];
		// Check if the file already exists in the folder.
		if(!file_exists($upload_path)) {
			// Check the size of the file. 
			// The file should be under 100 kb. But OVER 0 bytes.
			if($_FILES['file']['size'] < 100000 && $_FILES['file']['size'] > 0) {
				// If there are any errors.
				if($_FILES['file']['error']) {
					echo "Error: " . $_FILES['file']['error'];
				} else {
					// Success!
					echo "File successfully uploaded.<br /><br />";
					echo "The filename is: <strong>" . $_FILES['file']['name'] . "</strong><br />";
					echo "The filesize is: <strong>" . $_FILES['file']['size'] . "</strong><br />";
					echo "The filetype is: <strong>" . $_FILES['file']['type'] . "</strong><br />";
					echo "The file is temporary saved in: <strong>" . $_FILES['file']['tmp_name'] . "</strong><br />"; 
 
					// Move uploaded file to upload folder.
					move_uploaded_file($_FILES['file']['tmp_name'], $upload_path);
				}
			} else {
				echo $_FILES['file']['size'] < 1 ? 'Incorrect filename.' : 'File size is too big';
			} 
		} else {
			echo "File already exists in your folder. ";
		}
	}
}

// Specify the uploads folder in a variable. 
// This is exactly the same folder used in the upload script.
$dir = './uploads/';
 
// Try to open the directory.
if($dir = opendir($dir)) {
        // Create an HTML table using a small CSS style.
	echo '<table style="width: 250px;">';
        // Create the variable $file. If reading the dir DOESN'T turn out FALSE, print out the file with a link.
	while(($file = readdir($dir)) !== false) {
		// Remove the dots in $file. 
		if($file != '.' && $file != '..') {
			echo '<tr>';
                        // Print a link containing the name of the file.
                        // The link continues to delete.php?file=$filename. 
                        // This is used for deleting the uploaded file.
			echo '<td>' . $file . '</td><td><a href="delete.php?file=' . $file . '">delete</a>';
			echo '</tr>';
		}
	}
	echo '</table>';
        // Close the opened directory.
	closedir($dir);
}

// Using the superglobal $_GET, get the filename.
$file = $_GET['file'];
// The upload dir, exactlty the same as in the previous scripts.
$upload_dir = './uploads/';
// The complete file path to the file. 
$file_path = $upload_dir . $file;
// Check if the filepath is correct.
if(is_file($file_path)) {
        // Delete the file using the unlink function.
	unlink($file_path);
        // Give a message to tell the user, the file is deleted.
	echo "File " . $file . " deleted.";
}