HideMyMessage

.htaccess

RewriteEngine On
RewriteRule ^([A-Za-z0-9-]+)/?$ /index.php?key=$1 [NC,L]

HideMyMessage.php

<?php
/**
 * Simple system to share hidden messages
 * @author 834rd
 * @version 1.0
 */
class HideMyMessage
{
	protected $filePath = "messages/";
	
	/**
	 * Render the message form to create hidden messages
	 */ 
	public function renderForm()
	{
			
		?>

<script>
function pressed(e) {
	if ( (window.event ? event.keyCode : e.which) == 13) { 
		document.forms[0].submit();
	}
}
</script>
<form method="POST">
	<textarea name="hide_me" placeholder="Your message..." onkeydown="pressed(event)"></textarea>
	<input type="submit" style="left: -9999; position: fixed; overflow: hidden;" />	
</form>

<?php
	}
	
	/**
	 * Submit the form
	 */ 
	public function submitForm()
	{
		// Clear php errors and put post content to $message for better use
		if(isset($_POST['hide_me'])) $message = $_POST['hide_me'];
		
		// If form is the submit and message is not empty
		if($message) {
			
			// Create the file and get the unique key
			$key = $this->createMessage($message);
			
			// Return the unique key
			return $key;
		}
	}
	
	/**
	 * Create a message from
	 */
	public function createMessage($message) 
	{	
		
		// Create a unique key as message id and file name	
		$key = md5(microtime().rand());
		
		// File path
		$file = $this->filePath.$key.".txt";
		
		// Put the $message as content to file $file
		file_put_contents($file, $message);
		
		return $key;
	}
	
	public function viewMessage() 
	{	
		if(isset($_GET["key"]) && !empty($_GET["key"]) && $_GET["key"] && $_GET["key"] != null) { 
		
			$key = $_GET["key"];
			
			// Check if file with the name $key exists
			if(file_exists($this->filePath.$key.".txt")) : 
		
				// Get the content from file with the name $key
				$message = file_get_contents($this->filePath.$key.".txt", FILE_USE_INCLUDE_PATH);
		
				// Return file content as $message
				return $message;
			 else :

				// If file not exists render form
				$this->renderForm();
			endif;

		} else {
			$this->renderForm();
		}
	}	
}

Index.php

<?php 

require_once("functions.php"); 

$hmm = new HideMyMessage(); 

$key = $hmm->submitForm(); 

$message = $hmm->viewMessage(); 

echo (empty($key) ? $key : "<a href=\"?key=$key\">$key</a>"); echo $message;


?>