On Thu, Oct 29, 2009 at 11:11 AM, Robert Cummings <robert@xxxxxxxxxxxxx>wrote:
> Ashley Sheridan wrote:
>
>> On Thu, 2009-10-29 at 13:58 +0000, Mark Skilbeck wrote:
>>
>> How is the following evaluated:
>>>
>>> [code]
>>> if ($data = somefunc()) ...
>>> [/code]
>>>
>>> Ignoring the 'assignment inside condition' arguments, is the return value
>>> of somefunc() assigned to $data, and then $data's value is evaluated (to
>>> true or false), or is the actual assignment tested (does the assignment
>>> fail, etc)?
>>>
>>>
>>
>> I believe that it determines if the return value of somefunc() is
>> non-false. It will have the added benefit then that you can use the
>> return value afterwards if it was, for example, not true, but a string
>> or something instead.
>>
>
> I do this all the time... an example is the following:
>
> <?php
>
> if( ($user = get_current_user()) )
> {
> // Yay, we have a user... do something.
> echo $user->name();
> }
> else
> {
> // Handle no current user.
> echo 'Anonymous';
> }
>
> ?>
>
> Cheers,
> Rob.
> --
> http://www.interjinn.com
> Application and Templating Framework for PHP
>
>
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>
>
There is a situation when common-sense can fail...
if( $a && $b = do_something() )
The problem here is the precedence between && and =
The correct sentence will be...
if( $a && ($b = do_something()) )
C coders knows this behaviour very well.
cheers,
Martin Scotta
--
Martin Scotta
