array variables with or without quotes

I recently encountered a situation where I had to retrieve data from a MYSQL
database table with a field named "include". My code looked like this:

$content_result = mysql_query('SELECT * FROM calander') or
die(mysql_error());
$content_row = mysql_fetch_array($content_result);
if ($content_row[include])
{go do something;}

When I tried to run this, PHP treated the word -include- as a control
structure rather than an index name. Understandable. So, I put it in single
quotes ('include') to see what would happen and it works fine. But I don't
understand why!

What is the difference between $content_row [include] and
$content_row['include']? I have been unable to resolve this question in the
php manual, I need enlightenment.

2dogs

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Re: array variables with or without quotes

> When I tried to run this, PHP treated the word -include- as a control
> structure rather than an index name. Understandable. So, I put it in single
> quotes ('include') to see what would happen and it works fine. But I don't
> understand why!
>
> What is the difference between $content_row [include] and
> $content_row['include']? I have been unable to resolve this question in the
> php manual, I need enlightenment.

Without quotes it could be constant or defined variable:

define('variable', 'blah blah blah');

so then I can just use:

define('variable', 'blah blah blah');
echo variable;
?>

will print out:

blah blah blah

So in your case, it's checking for a defined variable called 'include'
which doesn't exist (and prints out a warning/notice).

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Re: array variables with or without quotes

2dogs wrote:

>I recently encountered a situation where I had to retrieve data from a MYSQL
>database table with a field named "include". My code looked like this:
>
>$content_result = mysql_query('SELECT * FROM calander') or
>die(mysql_error());
>$content_row = mysql_fetch_array($content_result);
>if ($content_row[include])
> {go do something;}
>
>When I tried to run this, PHP treated the word -include- as a control
>structure rather than an index name. Understandable. So, I put it in single
>quotes ('include') to see what would happen and it works fine. But I don't
>understand why!
>
>What is the difference between $content_row [include] and
>$content_row['include']? I have been unable to resolve this question in the
>php manual, I need enlightenment.
>
>2dogs
>
>
http://www.php.net/manual/en/language.types.array.php#langua ge.types.array.foo-bar

--
*****************************
Chuck Anderson • Boulder, CO
http://www.CycleTourist.com
Integrity is obvious.
The lack of it is common.
*****************************

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RE: Re: array variables with or without quotes

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I believe it is because without the quotes, it is expecting a predefined
constant. With the quotes, it is expecting an array key. This is why if you
use a word that is not defined as a constant, php will first look for it as
a constant, won't find it, then looks through the array treating it like a
key. If it is found as a constant, then the constant's value is used as the
key.

Jason

-----Original Message-----
From: Chuck Anderson [mailto:hairtwoday@gmail.com]
Sent: Wednesday, February 22, 2006 3:30 PM
To: php-general@lists.php.net
Subject: [PHP] Re: array variables with or without quotes

2dogs wrote:

>I recently encountered a situation where I had to retrieve data from a
>MYSQL database table with a field named "include". My code looked like
this:
>
>$content_result = mysql_query('SELECT * FROM calander') or
>die(mysql_error()); $content_row = mysql_fetch_array($content_result);
>if ($content_row[include])
> {go do something;}
>
>When I tried to run this, PHP treated the word -include- as a control
>structure rather than an index name. Understandable. So, I put it in
>single quotes ('include') to see what would happen and it works fine.
>But I don't understand why!
>
>What is the difference between $content_row [include] and
>$content_row['include']? I have been unable to resolve this question in
>the php manual, I need enlightenment.
>
>2dogs
>
>
http://www.php.net/manual/en/language.types.array.php#langua ge.types.array.f
oo-bar

--
*****************************
Chuck Anderson . Boulder, CO
http://www.CycleTourist.com
Integrity is obvious.
The lack of it is common.
*****************************

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Re: array variables with or without quotes

Chuck, you are the man! I decided to reread the manual word for word but
have only gotten through Strings as of last night. Thanks for zeroing me in
on the right spot.

txs
2dogs





"Chuck Anderson" wrote in message
news:34.21.50685.8C9CCF34@pb1.pair.com...
> 2dogs wrote:
>
>>I recently encountered a situation where I had to retrieve data from a
>>MYSQL database table with a field named "include". My code looked like
>>this:
>>
>>$content_result = mysql_query('SELECT * FROM calander') or
>>die(mysql_error());
>>$content_row = mysql_fetch_array($content_result);
>>if ($content_row[include])
>> {go do something;}
>>
>>When I tried to run this, PHP treated the word -include- as a control
>>structure rather than an index name. Understandable. So, I put it in
>>single quotes ('include') to see what would happen and it works fine. But
>>I don't understand why!
>>
>>What is the difference between $content_row [include] and
>>$content_row['include']? I have been unable to resolve this question in
>>the php manual, I need enlightenment.
>>
>>2dogs
> http://www.php.net/manual/en/language.types.array.php#langua ge.types.array.foo-bar
>
> --
> *****************************
> Chuck Anderson • Boulder, CO
> http://www.CycleTourist.com
> Integrity is obvious.
> The lack of it is common.
> *****************************

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