VBS FAQ: VBScript Functions and their usage syntax

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If you've ever lost a monitor to VBScript (from frustrated punching, mine has dents), Eric Lippert provides some solace in that there's at least a reason why it behaves that way.

In JScript you can do something like this:

if (blah != null && blah.frob == 123)

and it works just fine. But in VBScript

If (Not Blah Is Nothing) And (Blah.Frob = 123) Then

Then if Blah actually is Nothing, this still crashes and dies, whereas JScript does not. What the heck is going on here?

What's going on is that VBScript is not logical. VBScript is bitwise. All the so-called logical operators work on numbers, not on Boolean values! Not, And, Or, XOr, Eqv and Imp all convert their arguments to four-byte integers, do the logical operation on each pair of bits in the integers, and return the result. If True is -1 and False is 0 then everything works out, because -1 has all its bits turned on and 0 has all its bits turned off. But if other numbers get in there, all bets are off.

I didn't say it was a good reason. I just said it was a reason.

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PHP: date_sunrise - Manual: I don't know how closely you all are looking at the PHP 5 function libraries, but I stumbled on this function today (and its sibling).

date_sunset() returns the sunset time for a given day (specified as a timestamp) and location. The latitude, longitude and zenith parameters default to the date.default_latitude, date.default_longitude and date.sunset_zenith configuration options, respectively.

The latitude defaults to North. So, if you want to specify a South value, you must pass a negative value. The same note applies to longitude, which defaults to East.

I love PHP, but I really wonder about things like this. We've talked before about some problems with the language (especially compared to Perl), like inconsistent function naming, and — as this function perhaps demonstrates — having too many functions in the core.

Isn't this something that PEAR could have handled? Does this need to be built into the core? What percentage of PHP programmers have a need for this?

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VBS FAQ: VBScript Functions and their usage syntax

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