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I am trying to design High level design and low level design for a web application (PHP). But I am stuck with what is the basic difference between them. And also what are their components. And also where does the database design and business logics lie between two.
Well, as many people there are as many answers and opinions you will probably get but here are my $0.02.
In my practice high-level design has been identifying major goals of the application, splitting them to separate global modules, sections of your website, global functionality blocks addressing particular customer/user needs. Also here I would identify the global business logic of the application. Global database design can also be a part of it, but not down to the tables or databases, but rather which data will be stored and which not, how long, etcetera.
Low-level design will in turn take each building block that came out of high-level design and break it up to even smaller parts, where you’d be thinking about your data strictures, PHP classes, database tables, data exchange and so on.