Thanks for the reply. What about he use of '!' with the strcmp() command. As I understand it, strcmp compairs two strings and returns <0 if str1 is less than str2, returns 0 if they are equal and returns >0 if str1 is greater than str2. At least that's what the PHP online manual says.
How does the '!' "NOT" switch work with this? Is it saying If str1 and str2 are not equal? Or is it saying If str1 and str2 are not compared? Thanks, Jeff > -----Original Message----- > From: Jonathan Villa [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 25, 2003 12:50 PM > To: [EMAIL PROTECTED] > Subject: Re: [PHP] Help understanding code... > > > ! means not, for example $yes != $no > > Regarding the (xxx) ? x : x; > Your assumption is correct > > I use it alot, but sometimes it's still better to use if/else > statements > > On Thu, 2003-09-25 at 11:47, Jeff McKeon wrote: > > I've just picked up a more advanced book on PHP and it has a lot of > > example code in it. I understand most of it but some things > I'm seeing > > I don't understand. Like the following... > > > > code: > > > -------------------------------------------------------------- > ---------- > > -------- > > > > $couponcode = (! empty($_REQUEST['couponcode'])) ? > > $_REQUEST['couponcode'] : NULL; > > > ---------------------------------------------------------------------- > > -- > > -------- > > > > I think this is saying: > > > > If the global variable couponcode is not empty, then the variable > > '$couponcode' is equal to "$_REQUEST['couponcode']" > otherwise it gets > > a "NULL" value. > > > > What's throwing me is the use of the "!" and "?" and ":" > > > > If What I suspect is correct, I've never seen an if-then statement > > like this. If it is a replacement for an IF-Then statement > then it's > > much cleaner and I'd like to use it. > > > > another one is: > > > > > > code: > > > -------------------------------------------------------------- > ---------- > > -------- > > IF (!strcmp($operator, '+')) { > > $result = $num1 + $num2 > > } > > > -------------------------------------------------------------- > ---------- > > -------- > > > > I've looked up strcmp() and know it's used to compair two > strings. The > > $operator variable in the script that this was taken from is set to > > either "-", "+", "*" or "/". What I don't understand here > is what the > > "!" in front of strcmp() means. > > > > Can anyone break down the code for me and explain the parts? > > > > thanks, > > > > Jeff > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
