symfony - Whats the best way to code PHP application with a PHP framework that minimises dependencies -

i new php development (and indeed web development , undertaking research on best way code against mvc php framework. i'm looking find out whether there establised technique code application using php framework minimise dependency, if wanted move 1 framework minimum effort , without having start on again. similar technique i've seen databases - doctrine, can use provides generic database layer code against don't have strong dependencies mysql or sqlserver etc, can switch between them @ ease. php frameworks i'm condering zendframework, symfony & cakephp.

as c++/c# developer, instinct develop set of generic wrapper classes job inteface framework such rest of code has no dependencies on 1 php framework, wouldnt want if there library provides already. hope makes sense.

effectively, im asking is: "is there doctrine equivalent php frameworks?"

no. there's not.

the whole point of frameworks provide bunch of stuff make life easier , allow write less code. happens using features of framework - ie, making application dependent on framework. , each framework different.

the way make app not depended on framework not use 1 - silly approach because means more work you.

i've never heard of doctrine, if understand correctly, different scenario. mysql, postgres, sql server etc kind of meant implementing same thing - sql. in cases there minor differences in sytax, abstraction layers can account allowing switch between databases easily. in cases 1 implements features not have, there's nothing abstraction layer can help.

unlike implementations of sql, frameworks don't have agreed upon set of standards, way make easy switch between them isn't possible.