PHP question mark

Question

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

Can anyone explain to me what that question mar

Answer 1

Actually this statment is representing a Ternary operation, a conditional expression:

// works like:    (condition) ? if-true : if-false;

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

in your case $hideCode will have style="display:none;" value if

$likesObj->isAlreadyLikedByUser(facebookUID())

will return true, else it will be null or empty.

Answer 2

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

This is the same as the following:

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

Answer 3

It's a shorter version of a IF statement.

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

if in fact :

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

For the purism :

It's representing a Ternary operation

Answer 4

This is the simple if-then-else type logic:

(condition) ? (if-true-value) : (if-false-value)

so in your case, the condition is checked (i.e. has the page already been liked by the user); if yes (true condition), then style="display:none;" is printed so that whatever the element you're using is not displayed. Otherwise, an empty string is printed, which is the equivalent of not printing anything at all, naturally.

Answer 5

It's part of a ternary operator. The first part is the conditional of an if-else statement. After the question mark is the "if" block, and after the colon is the "else" block.

Answer 6

It is the ternary operator: it means

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