PHP Error Function name must be a string

Question

I added the following lines to the top of my PHP code  but it throws an error      Fatal error  Function name must be a string in  home reg php on line 2    lt  php if    COOKIE  CaptchaResponseValue       false         header  location index php        return      gt    I tried    COOKIE  CaptchaResponseValue    The cookie is successfully set and is available  Why is it giving me an error when I am using   COOKIE

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lt  php     require once     config config php       require once     classes class College php        Response   array         Parms     POST       Parms  Id     Id              Parms  function      DeleteCollege           switch   Parms  function              case  InsertCollege                  Response   College  InsertCollege  Parms               break                    case  GetCollegeById                  Response   College  GetCollegeById  Parms  Id                 break                    case  GetAllCollege                  Response   College  GetAllCollege                break                    case  UpdateCollege                  Response   College  UpdateCollege  Parms               break                    case  DeleteCollege                 College  DeleteCollege  Parms  Id                  Response   array  status    gt   R                break                      echo json encode  Response     gt

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Using parenthesis in a programming language or a scripting language usually means that it is a function   However   COOKIE in php is not a function  it is an Array  To access data in arrays you use square braces      and      which symbolize which index to get the data from   So by doing   COOKIE  test   you are basically saying   Give me the data from the index  test    Now  in your case  you have two possibilities   1  either you want to see if it is false--by looking inside the cookie or  2  see if it is not even there   For this  you use the isset function which basically checks if the variable is set or not   Example  if   isset   COOKIE  test         And if you want to check if the value is false and it is set you can do the following   if   isset   COOKIE  test     amp  amp    COOKIE  test       false      One thing that you can keep in mind is that if the first test fails  it wont even bother checking the next statement if it is AND    amp  amp      And to explain why you actually get the error  Function must be a string   look at this page  It s about basic creation of functions in PHP  what you must remember is that a function in PHP can only contain certain types of characters  where   is not one of these  Since in PHP   represents a variable   A function could look like this   myFunction   myFunction123 myFunction and in many other patterns as well  but mixing it with characters like   and   will not work

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A useful explanation to how braces are used  in addition to Filip Ekberg s useful answer  above  can be found in the short paper Parenthesis in Programming Languages

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It will be   COOKIE  CaptchaResponseValue    not   COOKIE  CaptchaResponseValue

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If you wanna ascertain if cookie is set   use  if  isset   COOKIE  cookie

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It should be   COOKIE  name    not   COOKIE  name      COOKIE is an array  not a function

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Try square braces with your   COOKIE  not parenthesis  Like this    lt  php if    COOKIE  CaptchaResponseValue       false         header  Location  index php        return      gt    I also corrected your location header call a little too

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In PHP js    COOKIE is a function  -     function   COOKIE name        var nameEQ   name            var ca   document cookie split           for var i 0 i  lt  ca length i              var c   ca i           while  c charAt 0        c   c substring 1 c length       if  c indexOf nameEQ     0  return decodeURIComponent c substring nameEQ length c length  replace     g    20               return null      via http   phpjs org functions setcookie 509

[php] PHP Error: Function name must be a string

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