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I have a content type called article where i have 6 fields.
But i need to display and hide this fields based on user group while add and edit node.
I am confused about which hook should i use.I am planning to use hook_page_alter().Please let me know wheather it is the correct hook i am using.Thanks a lot.
If I understand you right you'd be better off using the Field Permissions module:
The Field Permissions module allows site administrators to set field-level permissions to edit, view and create fields on any entity.
If you do code it yourself you're going to end up implementing most of that modules functionality, so even if you don't use it it's a great place to look for the right hooks to call etc.
