notices nightmare - looking for a regex solution

Hi there, I am working on a pretty huge site with thousands of files with php code. Unfortunatelly the app throws a ton of notices du to missing '' in arrays. Of course I could simply disable the output on the dev server to surpress notices, but I would rather like to get it fixed. Has somebody a good idea on how to fix this automated somehow with regex? The vars are right now: $var[element] and should be $var['element'] I was looking into sed, but I was hoping that there is also a way in php. Has anybody a hint on how to get the regex done? I appreciate any help on that. Best regards, Merlin