You'll need to create a custom CB plugin that extends the field validation. Basically the same way CB Query Field adds query validation except it'll need to use whatever PHP based API you need. I may add PHP based validation once I've created and released CB Code Field, which will output PHP as a field value (behave same as CB Query Field, but with PHP), but this won't be available until after CB 2.0 goes stable.
Kyle (Krileon)
Community Builder Team Member
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My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.