[thelist] single quotes and arrays

[Nadeem Hosenbokus]

I may have misunderstood what you intended (apologies if so) but this code:

title = 'daniel'
$_GET[ title ]

does not resolve to $_GET['daniel'].

Its usage would be like this:

$title = 'daniel';
$_GET['title'] = $title;
echo $_GET['title'];

would print out "daniel".

echo $_GET['daniel'] would result in some kind of error because the key isn't set in the array.



Nadeem Hosenbokus
(230) 5766 9169
www.nadeemh.com
http://mu.linkedin.com/in/nadeemhosenbokus


-----Original Message-----
From: thelist-bounces at lists.evolt.org [mailto:thelist-bounces at lists.evolt.org] On Behalf Of Volkan Özçelik
Sent: 24 April 2016 06:08
To: thelist at lists.evolt.org
Subject: Re: [thelist] single quotes and arrays

My guesstimate is:

In `$pageid = $_GET[pageid];` you are doing a direct assignment and hence the PHP interpreter can get clever enough to "catch" what you meant.

In ` ""<option value=\"$row['id']\">$row['title']</option>\n" ` however, it is string interpolation; so it’s an additional level of indirection, and PHP interpreter is not ready to infer what you meant and erring out.

As a best practice you should always be using quoted attributes as not using them may be mixed with a variable with the same name. (

e.g. `

title = 'daniel'
$_GET[ title ]
`
will resolve to $_GET['daniel'] which probably will be undefined.

Just my 2c.

Would love to hear other PHP experts’ ideas on that though.



HTH.

Volkan.

On Sat, Apr 23, 2016 at 5:52 PM Garth Hagerman <hagerman at mcn.org> wrote:

> Hi everybody-
> Since The List is alive again (hooray!), here's a query.
> I've been making the same boo-boo over and over for years. I have a 
> rote mechanical understanding of what to do about it, but I do not 
> understand the conceptual background.
>
> In PHP, I pass info to another page using a form. The page receiving 
> the info has a line like this:
> $pageid = $_GET[pageid];
>
> This works, so there doesn't seem to be anything wrong, so I do it 
> over and over and over. But it logs something like this into the error_log:
> "PHP Notice:  Use of undefined constant pageid - assumed 'pageid' ".
>
> Since this happens a lot, the error_log gets to be a very large file.
>
> So, I understand how to stop getting that notice: put single quotes 
> around pageid.
> But why? pageid isn't a string, it's the name of an array element. If 
> I do the same single quote thing with other arrays, something like:
> echo("<option value=\"$row['id']\">$row['title']</option>\n");
>  it's a fatal error and the whole page explodes.
>
> I've tried to find a reasonable explanation online, but haven't found 
> anything which makes the little "eureka!" light over my head light up.
>
>   Thanks in advance
>   Garth
>
>
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>
>                           http://garthhagerman.com/
>
>
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>
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