Understanding the ternary operator

Question

I have the following example:

$a=false;
$b=true;
$c=false;
if($a ? $b : $c){
   echo 'false';
} else {
   echo 'true';
}

I can't seem to understand this statement,and i need someone to explain me how it works...

Answer 1

$a=false;
$b=true;
$c=false;
if($a ? $b : $c){
   echo 'false';
} else {
   echo 'true';
}

expands to:

$a=false;
$b=true;
$c=false;
if ($a) {
  $temp = $b; // TRUE
} else {
  $temp = $c; //FALSE
}
if($temp){
   echo 'false';
} else {
   echo 'true';
}

because $a is false, $temp is assigned $c value (which is false), second if checks if $temp is true (which is not), so else statement is executed echo 'true'