How to enable autocomplete/syntax-highlight for PHP core functions in Eclipse?

Question

I searched a lot, checked many times the neccesary steps, but it still don't work.

My environment is :

1. Latest eclipse for PHP developer package

2. Project is newed, not check out directly from SVN

3. .project has a line

   <nature>org.eclipse.php.core.PHPNature</nature>
   

4. .buildpath has a line

   <buildpathentry kind="con" path="org.eclipse.php.core.LANGUAGE"/>
   

5. .settings/org.eclipse.core.resources.prefs has a line

   include_path=0;/projectname
   

6. file ensured opened in PHP Editor

Something works:

1. PHP core function defination displayed when mouse over, and Ctrl+Click will open its defined file, but input 'arr' nothing happens
2. Autocomplete does work for internal functios/variables such as class members But never works for PHP core functions, neither syntax highlighting

Answer 1

Right-Click on your project -> Configure -> Add PHP Support...

Works for me on Eclipse 3.5 / PDT 2.1

Answer 2

If have the problem that $this-> does nothing, so eclipse can't find the function names and variables that are right there in the class! also from outside $class-> does nothing either. Come to think about, nothing related to classes auto-completes. Variables and core functions and self-defined (non class) functions auto-complete though.