Last updated December 19, 2012. Created by hwi2 on December 19, 2012.
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I find on some Drupal sites that I want to see information all the time behind the scenes, but I don't want the client to see. I added simple code to allow me to do just that. While it is true that I can use the Devel or Devel Themer modules, there is some information that I want which is not provided by Devel, so creating my own custom code works. This code can be embedded into a block, module, or in just the page.tpl.php (or any page template suggestions).

Now, to make things simpler in this tutorial, I embedded inline CSS, but you can obviously add this to any .CSS file.

global $user;
$username = $user->name ;
                                if($username=="developer")
                                {
                                // Generate all your Drupal and PHP variables
                                    $nid = arg(1);
                                    $alias = drupal_get_path_alias();
                              // Print out your HTML div tag with inline CSS or CSS class attribute
                                    echo ('
                                        <div style=" position:fixed; top:65%; left:85%; background:#333; opacity:.9; border:2px solid #FF9; border-radius:10px; padding:20px; width:150px; height:150px; color:yellow; padding-top:15px;  ">
                                        <h5>Developers Only:</h5>
                                        <a style=" color:cyan;" href="' . $base_url . '/node/' . $nid . '/edit">
                                            Edit This Page</a><br/>
                                            <p>alias: ' . $alias . '</p>
                                        </div>
                                        ');
                                }

In this code, I get the username of the logged in user:

                                global $user;
                                $username = $user->name ;

From there, I create my Drupal data and CSS/HTML. You can add any Drupal code and print it out including theme info, module info, taxonomy, views, blocks.

if($username=="developer") {

You can customize this for any username using IF conditionals or PHP switch commands. For more than one user, create an array and use a PHP in_array() function to display different DIVs to different users.

For my CSS, I fix the box to the lower right hand corner of my screen and add some opacity for a nice effect.

Looking for support? Visit the Drupal.org forums, or join #drupal-support in IRC.