The Advanced Wordpress Theme Editor plugin will allow you to edit your theme directly in your blog admin section but with a better experience since it will format and highlight your source code with nice colours.
The plugin is compatible with WP 2.8 and less and is based on the Edit Area script that supports at least PHP, CSS, JS and many more file types.
安装:
This section describes how to install the plugin and get it working.
e.g.
Upload plug-in folder to the /wp-content/plugins/ directory
Activate the plugin through the 'Plugins' menu in WordPress