PHP API/Documentation

Hi everybody,
I just started using CKEditor. In the "_samples" folder that comes with the editor, there is a "php" folder with calls to CKEditor in php, like the following:

<?php
            // Include CKEditor class.
            include_once "../../ckeditor.php";
            // The initial value to be displayed in the editor.
            $initialValue = '<p>This is some <strong>sample text</strong>.</p>';
            // Create class instance.
            $CKEditor = new CKEditor();
            // Path to CKEditor directory, ideally instead of relative dir, use an absolute path:
            //   $CKEditor->basePath = '/ckeditor/'
            // If not set, CKEditor will try to detect the correct path.
            $CKEditor->basePath = '../../';
            // Create textarea element and attach CKEditor to it.
            $CKEditor->editor("editor1", $initialValue);
         ?>

By the look of it, I assume there is a PHP API, but I was unable to find any documentation...Until now I have been using CKEditor the following way:

// CKeditor
   echo "<script type=\"text/javascript\">\n";
   echo "\tCKEDITOR.replace('${leNom}',\n";
   echo "\t{\n";
   echo "\t\ttoolbar : 'sml'\n";
   echo "\t}\n";
   echo ");\n";
   echo "</script>";

Which is far from convenient...

Can somebody point me to some documentation please?

Aziz Light