Netbeans for PHP is a great free IDE for only 25mb. Go ahead and Download it

DooPHP works well with Netbeans IDE too. Just add the doophp framework directory to your Netbeans project path and you are good to go with auto-completion and code-hinting. You don’t even need to open up the framework documentation!

Add path to your project:

DooPHP works great with Netbeans

Code hinting support! Isn’t it cool?