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Php If statement

Posted on 2009-05-15
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Last Modified: 2012-05-07
What do : and ? mean in if statements?

As in
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect){
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Question by:walker6o9
8 Comments
 
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Ray Paseur earned 250 total points
ID: 24399212
It's a true false comparison.

if (statement) ? do this if true : do this if false ;
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by:fsouzabrasil
fsouzabrasil earned 100 total points
ID: 24399215
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect)

is

if ($redirect = ($mobile_browser==true)){
  $mobileredirect;
}else{
  $desktopredirect;
}
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by:climbgunks
climbgunks earned 100 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


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by:wellhole
wellhole earned 50 total points
ID: 24399221
a ? b : c means if a is true, then b, otherwise c.

So, your statement sets $redirect to the results of the browser check. Then if that value is not blank, zero, or null, then it enters the if statement.
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by:Ray Paseur
Ray Paseur earned 250 total points
ID: 24399254
Frankly, I find these sort of compound statements to be confusing.  Not sure what is expected to happen after that last curly bracket on the line in the OP.  But it looks to me like the code is trying to set up a redirect string of some sort.
// CHOOSE REDIRECT FOR MOBILE OR DESKTOP
if ($mobile_browser==true)
{
    $redirect = $mobileredirect;
} else
{
    $redirect = $desktopredirect;
}

Open in new window

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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";
}
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Expert Comment

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


http://uk.php.net/ternary
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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
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