PHP question mark

Question

$hideCode = $likesObj->isAlreadyLikedByUser(facebookUID()) ? \'style=\"display:none;\"\' : \'\';

Can anyone explain to me what that question mar

Answer 1

$hideCode = $likesObj->isAlreadyLikedByUser(facebookUID()) ? 'style="display:none;"':'';

This is the same as the following:

if ($likesObj->isAlreadyLikedByUser(facebookUID()))
{
    $hideCode = 'style="display:none;"';
}
else
{
    $hideCode = '';
}