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if ($b[$a]) $a=$b[$a]; More elegant way to write this? Derik 07-04-2008
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Posted by Derik on July 4, 2008, 1:00 pm
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 Okay, I'm using this construction a LOT lately:
if ($b[$a]) $a=$b[$a]
(The IF is actually usually an isset() or != '' ... bu you get the
picture.)

I do it a lot, and it's really... awkward, both in terms of code and
the logical flops involved. I'm clearing info being passed to DB
queries, so a typical example might be:

$a = 'first'; //A value passed through a query string;

$b = array( 'first' => 'first_name',
'last' => 'last_name' ); //A conversion array. Some of
these are extremely complicated and swap out dependent on
circumstances, so I'm pretty happy with this as a way of double-
checking my queris befroe the hit the $sql;

if ( $b[$a] != '' ) $a = $b[$a]; //Get 'first_name';

Lookid how logn that was! And I had to repeat the array nest twice!
It's not that big a deal- except the ACTUAl queries I'm working on are
a bit more like...

if ( isset($this->sort_order[$extra['sort_order']]) )
$extra['sort_order'] = $this->sort_order[$extra['sort_order']];

...yeah. Is there a simple way to perform this operation WITHOUT
writing a custom function that I'm missing?

-Derik

Posted by Iván Sánchez on July 4, 2008, 1:37 pm
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 Derik wrote:

> if ($b[$a]) $a=$b[$a]

$a = $b[$a] || $a;


Cheers,
--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-

Las ideas no duran mucho. Hay que hacer algo con ellas.- Ramon y Cajal.

Posted by Thomas Mlynarczyk on July 4, 2008, 2:02 pm
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Iván Sánchez Ortega schrieb:
> Derik wrote:
>
>> if ($b[$a]) $a=$b[$a]
>
> $a = $b[$a] || $a;

Nope. This would return a Boolean in PHP. (In JavaScript or Python it
would work, though.)

Greetings,
Thomas

--
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)

Posted by The Natural Philosopher on July 4, 2008, 2:52 pm
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Thomas Mlynarczyk wrote:
> Iván Sánchez Ortega schrieb:
>> Derik wrote:
>>
>>> if ($b[$a]) $a=$b[$a]
>>
>> $a = $b[$a] || $a;
>
> Nope. This would return a Boolean in PHP. (In JavaScript or Python it
> would work, though.)
>
> Greetings,
> Thomas
>
$a=(($b[$a])? $b[$a]:$a);

Posted by C. (http://symcbean.blogspot.c on July 6, 2008, 6:57 am
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wrote:
> Iv=E1n S=E1nchez Ortega schrieb:
>
> > Derik wrote:
>
> >> if ($b[$a]) $a=3D$b[$a]
>
> > $a =3D $b[$a] || $a;
>
> Nope. This would return a Boolean in PHP. (In JavaScript or Python it
> would work, though.)
>
> Greetings,
> Thomas
>
> --
> Ce n'est pas parce qu'ils sont nombreux =E0 avoir tort qu'ils ont raison!
> (Coluche)

($a=3D$b[$a]) || ($a=3D'first');

C.

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