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Posted by Philip Hallstrom on 08/25/05 04:38
> Is there a technical reason why PHP does not allow comparison operator
> expressions like the following:
>
> if (2 < $x <= 4) {}
>
>
> I prefer this concise way as it is common for mathematics expressions, and
> much easier to grasp physically on first glance. From what I can tell, this
> expression can currently only be written as:
>
> if ( $x > 2 && $x <= 4) {}
I'm sure someone who knows more about it than me will chime in with the
real reason, but at first glance how would the interpreter interpret it?
Given 2 < $x <= 4, do you mean:
2 < $x && $x <= 4
or do you mean
(2 < $x) <= 4
where 2 < $x will evaluate to true or false. Doesn't make much sense as a
condition, but it's there...
Also, you could wrap it in a function if you find you use it a lot..
function between($x, $min, $max) {
return( $min < $x && $x < $max );
}
-philip
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