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Editing PHP in TinyMCE 3.2.x

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Here is quick and dirty way to add PHP editing capabilities to your TinyMCE.

Javascript

On the JavaScript side initiate TinyMCE as you normally would, and add setup editor event ( in bold below)

<script type="text/javascript">
    tinyMCE.init({
    mode : "textareas",
    theme : "advanced",
    theme_advanced_buttons1 : "mybutton,bold,italic,underline",
    theme_advanced_buttons2 : "",
    theme_advanced_buttons3 : "",
    theme_advanced_toolbar_location : "top",
    theme_advanced_toolbar_align : "left",
    theme_advanced_statusbar_location : "bottom",
    plugins : 'inlinepopups',
    setup : function(ed) {

   //This event (onBeforeSetContent)gets executed when the setContent method is called
   //gets executed when the setContent method is called but before the contents gets
   //serialized and placed in the editor.         
          ed.onBeforeSetContent.add(function(ed, o) {
               //replace all instances of <?php and ?> with HTML entities
                o.content = o.content.replace(/<\?/gi, "&lt?");
                o.content = o.content.replace(/\?>/gi, "?&gt");
          });
     }
});
</script>

PHP 

On the PHP side take the TinyMCE content and convert the HTML entities back  to <?php and ?> 
$content = str_replace("&lt;?php", "<?php", $content);
$content = str_replace("?&gt;", "?>",$content);

Note

When using this technique it is recommended to use Code Editor instead of WYSIWYG interface to write PHP code.  You may also want to create a simple CSS class to wrap and hide code from inexperienced users. For example you could create something like this:

CSS

.php_code{
    border:1px dotted #C63;
    padding:2px 2px 2px 15px;
    width:100px;
    height:12px;
    background:url(php_code.gif) no-repeat center left;
    color:#fff;
}

Inside TinyMCE wrap your PHP code with: <div class="php_code">&lt;?php  ?&gt;</div>. Users would then see something like this: instead of your PHP code.