As a DACA student, am I eligible for PhD funding?
The most common kinds of funding for PhD students in the US are research assistantships and teaching assistantships.  Typically neither of these types of funding have rules about the citizenship status of the student.  These types of funding would provide a DACA PhD student with tuition and a stipend for living expenses.  

Some prestigious, higher paying fellowships offered by the federal government would not be available to a DACA student.  For example, the NSF GRFP requires permanent residency.  The NDSEG, being funded by the military, requires citizenship or national status.  

On a broader note, if you cannot get financial aid including a stipend, you should not get a PhD.  If the university thinks you will be a good PhD student, they will be willing to pay you.  This advice does not apply to professional degrees.