how to nest if and else statement using ternary operator in PHP?

Question

am confused with using this ternary operator, i can easily get 1 level if and else eg

($blah == $blah) ? blahblah : blahblahblah;

but what if the condition is like this?

if($blah == blah1)
{ 
  echo $blah1;
}
else if($blah == blah2)
{
 echo $blah2;
}
else
{
 echo $blah;
}

how to convert this using ternary operator ?

Answer 1

<?php echo $blah == 'blah1' ? $blah1 : ($blah == 'blah2' ? $blah2 : $blah); ?>

Notice how the else is wrapped in parenthesis. This can be done again and again, although it becomes confusing to read.

Answer 2

Nested ternaries are a bad idea. They're provided for brevity. If you have nested conditions, you by definition do not have brevity.

Some folk don't even like their use when you have a concise statement. Personally I find the following more clear and readable than the if -based alternative.

echo $success ? 'Success' : 'Failure';

But I would hesitate to do anything more complex than that.

Answer 3

($blah == $blah1) ? $blah1 : (($blah == $blah2) ? $blah2 : $blah);

Answer 4

它将变成：

echo (($blah == $blah1) ? $blah1 : (($blah == blah2) ? $blah2 : $blah);