How to get the value of an associative array in PHP

I have the following array:

    $this->uploaders = array(
        'yt' => 'Youtube',
        'hl' => 'Hulu',
        'fd' => 'Funny or Die'
    );

In my script the following:

substr($uploader->external_id, 0, 2);

will always return either 'yt', 'hl' or 'fd'. I need to do a check to see which one it matches and return the value from the above array.

For example if substr($uploader->external_id, 0, 2) returned "yt" I need it to return "Youtube". How can this be done?

---

I think you're looking for:

$type = substr($uploader->external_id, 0, 2);
$longName = $this->uploaders[$type];

$longName will contain 'Youtube' if substr($uploader->external_id, 0, 2) contains 'yt'