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Re: Declaring an array necessary? [message #184971 is a reply to message #184970]

Fri, 21 February 2014 20:48

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 2/21/2014 3:04 PM, Christian Stadler wrote:
> Am 21.02.2014 18:56, schrieb The Natural Philosopher:
>> I was just wondering. Php assumes a varibale exists as soon as it is
>> assigned a value, but a function exists to create an array..
>> Sop can one just say
>>
>> $arr['hello']='sexy';
>>
>> or should there be
>>
>> $arr=array();
>>
>> first?
>
> Its generally a good idea to initialize a variable, before you change
> its contents, unless you are 100% sure, that the variable hasn't been
> initialized elsewhere or probably through whatever exploit and so on.
> But honestly: Can you be 100% sure? ;-)
>
> Another (quick and dirty) example would be :
>
> | $tablecontents = '';
> | foreach ($foo AS $bar => $moo) {
> | $tablecontents .= "\t<tr><td>$bar</td><td>$moo</td></tr>\n";
> | }
> | echo "<table>\n$tablecontents</table>\n";
>
> If you leave $tablecontents = ''; away, this could result in unwanted
> behaviour up to something even worse, like XSS-attacks.
>
> PS: If someone can explain this in a better way, feel free to do so. But
> please don't tell me, whats wrong in my post. Its just a quick and dirty
> example and probably not the best way to explain this. But right now,
> I'm not in the mood to recherche for hours and hours to ensure, that
> every single letter I type in a *.c.l.php-group is 100% correct ...
>
> Regards,
> Christian Stadler
>

Christian,

Nope, nothing wrong with your post. And I agree - it is almost always a
good idea to initialize a variable before using it.

How many times have you seen in this group NOTIFY messages being turned
off and/or ignored - then people complaining because the code doesn't
work as expected?

--
==================
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Jerry Stuckle
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		Declaring an array necessary? By: The Natural Philosoph on Fri, 21 February 2014 17:56
		Re: Declaring an array necessary? By: Christian Stadler on Fri, 21 February 2014 20:04
		Re: Declaring an array necessary? By: Jerry Stuckle on Fri, 21 February 2014 20:48
		Re: Declaring an array necessary? By: The Natural Philosoph on Fri, 21 February 2014 21:32
		Re: Declaring an array necessary? By: Gregor Kofler on Fri, 21 February 2014 21:55
		Re: Declaring an array necessary? By: Tim Streater on Fri, 21 February 2014 22:06
		Re: Declaring an array necessary? By: M. Strobel on Fri, 21 February 2014 21:58
		Re: Declaring an array necessary? By: Daniel Pitts on Fri, 21 February 2014 22:03

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