PHP or shell app that can replace chunk of php/AS/tpl functi by upperbrain

I need a shell script or php app that replace chunk of code on specific function, it sound like little stupid but this is what I need. Yup, main purposes are: 1. Scan 1000 php/as/tpl files 2. If there are function call that need to be changed, 3… (Budget: $30-$250 USD, Jobs: PHP, Shell Script)