Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Php If statement

Posted on 2009-05-15
8
Medium Priority
?
428 Views
Last Modified: 2012-05-07
What do : and ? mean in if statements?

As in
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect){
0
Comment
Question by:walker6o9
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 111

Accepted Solution

by:
Ray Paseur earned 1000 total points
ID: 24399212
It's a true false comparison.

if (statement) ? do this if true : do this if false ;
0
 
LVL 4

Assisted Solution

by:fsouzabrasil
fsouzabrasil earned 400 total points
ID: 24399215
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect)

is

if ($redirect = ($mobile_browser==true)){
  $mobileredirect;
}else{
  $desktopredirect;
}
0
 
LVL 11

Assisted Solution

by:Todd Mummert
Todd Mummert earned 400 total points
ID: 24399220

this is the conditional operator

<conditional> ? <true value> : <false value>


if conditional is true, the result of the expression is the value before the :,   otherwise the value
after the :

in your statement, the result is assigned to $redirect, and that value is used as true/false in the outer if conditional


0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 9

Assisted Solution

by:wellhole
wellhole earned 200 total points
ID: 24399221
a ? b : c means if a is true, then b, otherwise c.

So, your statement sets $redirect to the results of the browser check. Then if that value is not blank, zero, or null, then it enters the if statement.
0
 
LVL 111

Assisted Solution

by:Ray Paseur
Ray Paseur earned 1000 total points
ID: 24399254
Frankly, I find these sort of compound statements to be confusing.  Not sure what is expected to happen after that last curly bracket on the line in the OP.  But it looks to me like the code is trying to set up a redirect string of some sort.
// CHOOSE REDIRECT FOR MOBILE OR DESKTOP
if ($mobile_browser==true)
{
    $redirect = $mobileredirect;
} else
{
    $redirect = $desktopredirect;
}

Open in new window

0
 
LVL 3

Expert Comment

by:markh789
ID: 24400852
It means:
if (STATEMENT) ? STATEMENT_IS_TRUE :  STATEMENT_IS_FALSE)

So it could be

$var = ($hello == world) ? "yes" : "no");

if ($var == "yes") {
 echo "Yay! We got a Yes!";
} else {
 echo "Aw.. We go a No.";
}

It's just a quicker way to write:
$var = ($hello == world) ? "yes" : "no");

Then to write:
if ($hello == world) {
 $var = "yes";
} else {
 $var = "no";
}
0
 

Expert Comment

by:adamjimenez
ID: 24402060
it's called the ternary operator


http://uk.php.net/ternary
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 24403696
It's so known for its three parts: (1) statement, (2) true action and (3) false action.

http://dictionary.reference.com/browse/ternary
0

Featured Post

[Webinar] Lessons on Recovering from Petya

Skyport is working hard to help customers recover from recent attacks, like the Petya worm. This work has brought to light some important lessons. New malware attacks like this can take down your entire environment. Learn from others mistakes on how to prevent Petya like worms.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively.  This article explores the ways PHP can be used to hide and encrypt information.
Introduction This article is intended for those who are new to PHP error handling (https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html).  It addresses one of the most common problems that plague beginning PHP develop…
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
The viewer will the learn the benefit of plain text editors and code an HTML5 based template for use in further tutorials.

670 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question