DHTMLConsole

This plugin allows you to send a message from your web server (directly by running a server script or making an ajax call) to your browser by using an HTTP Header.

The only rule is that you need to send custom HTTP headers from your server with the name of the header starting with X-DHTML-CONSOLE.

To send a message from a PHP script to the browser, this implementation will suffice:

<?php
header('X-DHTML-CONSOLE-MSG: Hello World');
?>

As of version 0.3, you can now do javaScript alerts
<?php
header('X-DHTML-CONSOLE-MSG: alert:Hello World');
?>

As of version 0.3, you can clear the console from server by:
<?php
header('X-DHTML-CONSOLE-MSG: -clear-');
?>

To send multiple messages in PHP:

<?php
function dhtmlconsole($msg='') {
static $pos=0;
$pos++;
header('X-DHTML-CONSOLE-MSG'.$pos.': '.$msg);
}

//implementation
dhtmlconsole("Hello");
dhtmlconsole("World");
?>