How do I add my PHP directory to the PATH on Windows?

On Windows NT+ and Windows Server 2000+:

• Go to Control Panel and open the System icon (Start ->
  Settings
  -> Control Panel -> System, or just Start -> Control
  Panel
  -> System for Windows XP/2003+)

• Go to the Advanced tab

• Click on the ‘Environment Variables’ button

• Look into the ‘System Variables’ pane

• Find the Path entry (you may need to scroll to find it)

• Double click on the Path entry

• Enter your PHP directory at the end, including ‘;’ before (e.g.
  ;C:\php)

• Press OK

More information is here OR