php - Parse error: syntax error, unexpected ')', expecting :: (T_PAAMAYIM_NEKUDOTAYIM)

I have the following
code

define("SCRIPT_URL",
            "");
function ifScriptFolder() {
 if(isset(SCRIPT_URL) &&
            !empty(SCRIPT_URL)) {
 echo "/".SCRIPT_URL."/";
 } else {

            echo "/";

            }

}

but
it's giving me the following
error:

Parse error: syntax error,
            unexpected ')', expecting :: (T_PAAMAYIM_NEKUDOTAYIM) in *(path)* on line
            3

Can anyone see
what's going wrong here or how to fix it?

class="post-text" itemprop="text">

class="normal">Answer

If you trying to determine if
constant exists, then try to use rel="noreferrer">defined() or href="http://php.net/constant"
rel="noreferrer">constant(), not href="http://php.net/isset"
rel="noreferrer">isset().

/>

From rel="noreferrer">php.net:

Function
rel="noreferrer">defined():

Returns TRUE if the named constant given by name has been defined, FALSE
otherwise.

Function
rel="noreferrer">constant():

Returns the value of the constant, or NULL if the constant is not
defined.

/>

Fixed
function:

function
            ifScriptFolder() {
 echo defined('SCRIPT_URL') ? "/" . constant('SCRIPT_URL')
            . "/" :
            "/"
}

UPD:

The
defined() function is a better solution for this, because it
will not emit E_WARNING if constant was not
defined.