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Example:
public function prepare($sql, &$p = NULL) {
p is assigned by reference. I’m not sure if I can assign safely NULL here as default. Is that ok in this case?
Why would you want to have a default value for a parameter that is passed by reference? Isn’t the basic point of pass-by-reference that you can change the original variable in the caller’s scope? So if it has a default value, then you are not changing anything in the caller’s scope, so what’s the point?