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Re: Declaring an array necessary? [message #184970 is a reply to message #184969]

Fri, 21 February 2014 20:04

Christian Stadler
Messages: 2
Registered: February 2014

Karma:

Junior Member

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

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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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