PHP syntax question

I fo开发者_如何学Cund this line of code and I'm trying to comprehend what it's doing. The part I'm not familiar with is the question mark and the colon. What are these characters used for?

$string = $array[1] . ($array[0] === 47 ? '' : ' word');

---

That's a ternary operator; basically a short-hand conditional.

It's the same as:

$string = $array[1];

if ($array[0] !== 47)
    $string .= ' word';

See this section in the PHP manual (the "Ternary Operator" section).

---

That's the ternary operator.

Here's a reference to a tutorial

It works somehow like this:

function tern()

    if ($array[0] === 47)
    {
        return '';
    }
    else
    {
        return 'word';
    }
}