How exactly do I test for the presence of mysqli from within a script?
IIRC there's a function called extension_loaded(). Or something similar.
Or are you saying I have two different versions of my script?
Not at all. Taking PEAR::DB for example, you could test for the existence of mysqli, and use one DSN if it's there. If not, use another. This is one of the reasons abstraction layers exist.
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