PHP question mark

Question

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

Can anyone explain to me what that question mar

Answer 1

It is the ternary operator: it means

if $likesObj->isAlreadyLikedByUser(facebookUID()) is true assign style="display:none; to the variable, otherwise assign ''