|
Subject:
|
Need Help - Newbie
|
|
Posted By:
|
Nickph
|
Post Date:
|
9/23/2004 11:46:47 AM
|
Just started learning PHP...
looking at some code with statement:
$_SESSION[user][id] = $_POST[login_email] ? $_POST[login_email]: $_SESSION[user][id];
need to understand what this statement does
where can I find info on the operators ? :
Thanks , did not find info in my Beginning PHP4 book
|
|
Reply By:
|
Snib
|
Reply Date:
|
9/23/2004 12:34:45 PM
|
http://us4.php.net/manual/en/language.expressions.php
Basically, this is what this line is doing:
if($_POST[login_email])$_SESSION[user][id] = $_POST[login_email];
HTH,
-Snib <><
http://www.snibworks.com
There are only two stupid questions: the one you don't ask, and the one you ask more than once ;-)
|
|
Reply By:
|
Nickph
|
Reply Date:
|
9/24/2004 9:28:28 AM
|
Thanks
most helpful
|
|
Reply By:
|
richard.york
|
Reply Date:
|
9/26/2004 7:58:34 PM
|
That's called the ternary operator, it's an expression. You can find it in the PHP manual here:
http://www.php.net/manual/en/language.expressions.php
What happens is there are three subexpressions within the expression
$first? $second : $third;
The $first evaluates to a simple boolean. If it's true, the second subexpression is evaluated, which is the $second variable in the above example. If the $first subexpression evaluates to false, the third subexpression is evaluated.
Often times this can be represented in an identical if/else chain.
The ternary expression:
$foo = ($_POST['field'])? true : false;
is the same as this if/else chain:
if ($_POST['field'])
{
$foo = true;
}
else
{
$foo = false;
}
HTH!
Regards,
Rich
--
[http://www.smilingsouls.net]
[http://pear.php.net/Mail_IMAP] A PHP/C-Client/PEAR solution for webmail
|
