You use a session variable for that?
Why not?
That's entirely the wrong place to store something like which database API is installed.
Not really. You could even wrap a function called (for example) Feature() around it.
> It should a class
variable or global configuration variable. Heck, I'd say it's more appropriate to do extension_loaded( 'mysqli' ) on every call than to use a session variable.
Why? It's very unlikely to be changing between calls. And even if it does, it's once in a blue moon. Granted though, I can't see it being a particularly intensive function call, so I can't see the harm in calling it on every invocation.
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