I want to echo variable $a if it is set, or echo variable $b if variable $a was not set.
I tried something, but it doesn't work as expected:
<?
$a = "FOO";
$b = "BAR";
$c = $a OR $b;
echo $c; #output : FOO
//
$a = false;
$b = "BAR";
$c = $a OR $b;
echo $c; #output :
?>
I can do it using a function, like
function F($a,$b) {
if($a) return $a;
return $b;
}
or using this:
$c = $a ? $a : $b;
but maybe there is a better way to do this. I want the fastest way to accomplish this.
This is the closest to what you are trying to do:
$c = $a ?: $b;
(It is similar to $c = $a || $b in JavaScript.)
Note that this assumes the variables are actually set. If they aren't set (i.e., don't exist at all), you should really use isset.
You ask the right if it is set <-- isset()
so
$c = isset($a) ? $a : isset($b) ? $b : 'Both not set';
according to me $c = $a ? $a : $b; is the best way