Php If statement

What do : and ? mean in if statements?

As in
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect){
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walker6o9Asked:
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Ray PaseurConnect With a Mentor Commented:
It's a true false comparison.

if (statement) ? do this if true : do this if false ;
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fsouzabrasilConnect With a Mentor Commented:
if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect)

is

if ($redirect = ($mobile_browser==true)){
  $mobileredirect;
}else{
  $desktopredirect;
}
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Todd MummertConnect With a Mentor Commented:

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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wellholeConnect With a Mentor Commented:
a ? b : c means if a is true, then b, otherwise c.

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

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markh789Commented:
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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adamjimenezCommented:
it's called the ternary operator


http://uk.php.net/ternary
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Ray PaseurCommented:
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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