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Re: Declaring an array necessary? [message #184972 is a reply to message #184970]

Fri, 21 February 2014 21:32

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

On 21/02/14 20:04, 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
>
No that was a fine reply all in all.

Got the message of what you are trying to say - doesn't apply here
though: the data going into the array is all guaranteed clean.

--
Ineptocracy

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lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

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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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