KoolTreeView is the excellent treeview control for PHP, combining highly-efficient rendering and AJAX Load on Demand support for superior performance.
Key Features:
Render Thousand nodes in a second
Very simple PHP interface
Rich Client-side API
Search-Engine Friendly
Drag and Drop behavior
Edit Node behavior
Multiple-nodes Selection feature
AJAX-based Loading on Demand
State-persistent capability
Style can be all customized
