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Re: Declaring an array necessary? [message #184973 is a reply to message #184972]

Fri, 21 February 2014 21:55

Gregor Kofler
Messages: 69
Registered: September 2010

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Am 21.02.2014 22:32, The Natural Philosopher meinte:
> 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.

RTFM.

http://www.php.net/manual/de/language.types.array.php

"Creating/modifying with square bracket syntax"

should answer your question. However, I still prefer to initialize an
array explicitly. And if it is only for better readable code.

Gregor

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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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