Home > Archive > PHP DB > May 2007 > Re: [PHP-DB] variable with NULL value
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Re: [PHP-DB] variable with NULL value
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| James Gadrow 2007-05-03, 6:57 pm |
| OKi98 wrote:
> Hi,
>
> one more question.
>
> Why the variable, that contains NULL value appears to be not set. When
> you try to echo it the php does not produce warning about using
> undefined variable.
>
> //$connection contains database connection handler
> $result=mysql_query("select NULL as value",$connection);
> $tmp=mysql_fetch_array($result);
> $foo=$tmp["value"];
> if (!isset($foo)) echo("\$foo is not set but does not produce warning
> -$foo-");
>
> OKi98
>
Someone correct me if I'm wrong but it appears that you should be using
if(!isset($tmp["value"]) before assigning to $foo if you want to ensure
that $foo will, indeed, be set.
--
Thanks,
Jim
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| James Gadrow wrote:
> OKi98 wrote:
> Someone correct me if I'm wrong but it appears that you should be using
> if(!isset($tmp["value"]) before assigning to $foo if you want to ensure
> that $foo will, indeed, be set.
Yeh - you need to check before you do the assignment.
--
Postgresql & php tutorials
http://www.designmagick.com/
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