How to write a PHP ternary operator

Question

How do I write a PHP ternary operator with the elseif portion?

I see basic examples with the if and else portions of the PHP ternary operator like this:

echo (true)  ? "yes" : "no";    //prints yes
echo (false) ? "yes" : "no";    //prints no

How do I get the "elseif" portion like this into the ternary operator?

<?php 
  if($result->vocation == 1){
    echo "Sorcerer"; 
  }else if($result->vocation == 2){
    echo 'Druid';
  }else if($result->vocation == 3){
    echo 'Paladin';
  }else if($result->vocation == 4){
    echo 'Knight';
  }else if($result->vocation == 5){
    echo 'Master Sorcerer';
  }else if($result->vocation == 6){
    echo 'Elder Druid';
  }else if($result->vocation == 7){
    echo 'Royal Paladin';
  }else{
    echo 'Elite Knight';
  }
?>

Answer 1

I'd rather than ternary if-statements go with a switch-case. For example:

switch($result->vocation){
case 1:
    echo "Sorcerer";
    break;
case 2:
    echo "Druid";
    break;
case 3:
    echo "Paladin";
    break;
case 4:
    echo "Knight";
    break;
case 5:
    echo "Master Sorcerer";
    break;
case 6:
    echo "Elder Druid";
    break;
case 7:
    echo "Royal Paladin";
    break;
default:
    echo "Elite Knight";
    break;
}

Answer 2

You could also do:

echo "yes" ?: "no" // Assuming that yes is a variable that can be false.

Instead of:

echo (true)  ? "yes" : "no";

Answer 3

echo ($result ->vocation == 1) ? 'Sorcerer'
        : ($result->vocation == 2) ? 'Druid'
           :  ($result->vocation == 3) ? 'Paladin'
                    ....

;

It’s kind of ugly. You should stick with normal if statements.

Answer 4

In addition to all the other answers, you could use switch. But it does seem a bit long.

switch ($result->vocation) {
case 1:
    echo 'Sorcerer';
    break;

case 2:
    echo 'Druid';
    break;

case 3:
    echo 'Paladin';
    break;

case 4:
    echo 'Knight';
    break;

case 5:
    echo 'Master Sorcerer';
    break;

case 6:
    echo 'Elder Druid';
    break;

case 7:
    echo 'Royal Paladin';
    break;

default:
    echo 'Elite Knight';
    break;
}

Answer 5

To be honest, a ternary operator would only make this worse, what i would suggest if making it simpler is what you are aiming at is:

$groups = array(1=>"Player", 2=>"Gamemaster", 3=>"God");
echo($groups[$result->group_id]);

and then a similar one for your vocations

$vocations = array(
  1=>"Sorcerer",
  2=>"Druid",
  3=>"Paladin",
  4=>"Knight",
  ....
);
echo($vocations[$result->vocation]);

With a ternary operator, you would end up with

echo($result->group_id == 1 ? "Player" : ($result->group_id == 2 ? "Gamemaster" : ($result->group_id == 3 ? "God" : "unknown")));

Which as you can tell, only gets more complicated the more you add to it

Answer 6

A Ternary is not a good solution for what you want. It will not be readable in your code, and there are much better solutions available.

Why not use an array lookup "map" or "dictionary", like so:

$vocations = array(
    1 => "Sorcerer",
    2 => "Druid",
    3 => "Paladin",
    ...
);

echo $vocations[$result->vocation];

A ternary for this application would end up looking like this:

echo($result->group_id == 1 ? "Player" : ($result->group_id == 2 ? "Gamemaster" : ($result->group_id == 3 ? "God" : "unknown")));

Why is this bad? Because - as a single long line, you would get no valid debugging information if something were to go wrong here, the length makes it difficult to read, plus the nesting of the multiple ternaries just feels odd.

A Standard Ternary is simple, easy to read, and would look like this:

$value = ($condition) ? 'Truthy Value' : 'Falsey Value';

or

echo ($some_condition) ? 'The condition is true!' : 'The condition is false.';

A ternary is really just a convenient / shorter way to write a simple if else statement. The above sample ternary is the same as:

if ($some_condition) {
    echo 'The condition is true!';
} else {
    echo 'The condition is false!';
}

However, a ternary for a complex logic quickly becomes unreadable, and is no longer worth the brevity.

echo($result->group_id == 1 ? "Player" : ($result->group_id == 2 ? "Gamemaster" : ($result->group_id == 3 ? "God" : "unknown")));

Even with some attentive formatting to spread it over multiple lines, it's not very clear:

echo($result->group_id == 1 
    ? "Player" 
    : ($result->group_id == 2 
        ? "Gamemaster" 
        : ($result->group_id == 3 
            ? "God" 
            : "unknown")));