a simple if-login question

[Maxim Vexler]

if ((($value1 != null) || ($value1 != "")) && $value2 != "" && $value1
!= $value2) { ret false }

if i omit the [value2 != ""] i would still get the same result, right?
because I check if value1 != "" and then I check if value1!=value2
i.e. :

if ((($value1 != null) || ($value1 != "")) && $value1 != value2) { ret
false }

regards, maxim.

[steve]

Re: a simple if-login question

"Maxim Vexler" wrote:[color=blue]
> if ((($value1 != null) || ($value1 != "")) && $value2 != "" &&[/color]
$value1[color=blue]
>
> != $value2) { ret false }
>
> if i omit the [value2 != ""] i would still get the same result,[/color]
right?[color=blue]
>
> because I check if value1 != "" and then I check if[/color]
value1!=value2[color=blue]
> i.e. :
>
> if ((($value1 != null) || ($value1 != "")) && $value1 != value2)[/color]
{ ret[color=blue]
>
> false }
>
> regards, maxim.[/color]

I believe you are right. And you can simplify as well:
($value1 != null) || ($value1 != ""))
is equal to:
($value1 != ’’) [[don’t need the two statements]]
or if you have doubts, use:
(strlen($value1 ) > 0)

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[Ian.H]

Re: a simple if-login question

On Tue, 10 Aug 2004 23:28:15 -0400, steve wrote:
[color=blue]
> I believe you are right. And you can simplify as well:
> ($value1 != null) || ($value1 != ""))
> is equal to:
> ($value1 != ’’) [[don’t need the two statements]]
> or if you have doubts, use:
> (strlen($value1 ) > 0)[/color]


A variable assigned an empty string is _not_ the same as it being NULL.


if (!is_null($valu e1) and strlen($value1) < 1) {



Regards,

Ian

--
Ian.H
digiServ Network
London, UK

http://digiserv.net/

[Ian.H]

Re: a simple if-login question

On Wed, 11 Aug 2004 04:38:32 +0000, Ian.H wrote:
[color=blue]
> On Tue, 10 Aug 2004 23:28:15 -0400, steve wrote:
>[color=green]
>> I believe you are right. And you can simplify as well:
>> ($value1 != null) || ($value1 != ""))
>> is equal to:
>> ($value1 != ’’) [[don’t need the two statements]]
>> or if you have doubts, use:
>> (strlen($value1 ) > 0)[/color]
>
>
> A variable assigned an empty string is _not_ the same as it being NULL.
>
>
> if (!is_null($valu e1) and strlen($value1) < 1) {[/color]


Oops:


if (!is_null($valu e1) and strlen($value1) > 0) {


Better =)



Regards,

Ian

--
Ian.H
digiServ Network
London, UK

http://digiserv.net/

[Maxim Vexler]

Re: a simple if-login question

steve wrote:[color=blue]
> "Maxim Vexler" wrote:[color=green]
> > if ((($value1 != null) || ($value1 != "")) && $value2 != "" &&[/color]
> $value1[color=green]
> >
> > != $value2) { ret false }
> >
> > if i omit the [value2 != ""] i would still get the same result,[/color]
> right?[color=green]
> >
> > because I check if value1 != "" and then I check if[/color]
> value1!=value2[color=green]
> > i.e. :
> >
> > if ((($value1 != null) || ($value1 != "")) && $value1 != value2)[/color]
> { ret[color=green]
> >
> > false }
> >
> > regards, maxim.[/color]
>
> I believe you are right. And you can simplify as well:
> ($value1 != null) || ($value1 != ""))
> is equal to:
> ($value1 != ’’) [[don’t need the two statements]]
> or if you have doubts, use:
> (strlen($value1 ) > 0)
>[/color]

in fact, and please correct me if I'm wrong :
the logic (($value1 != null) || ($value1 != "")) is totally useless !
because no matter what the input is you always get true from it, right?