Call to undefined function App Http Controllers function name

Question

In my controller  I create a function getFactorial  public static function getFactorial  num         fact   1      for  i   1   i  lt    num   i             fact    fact    i      return  fact      Then  I use it like this   public function codingPuzzleProcess           word       strtoupper Input  get  word          length     strlen  word        max value     length   26        characters   str split  word         num   1        index   1       sort  characters        foreach    characters as  character             num    getFactorial  index     index           index                return Redirect  to   coding-puzzle           - gt with  word    word           - gt with  num    num           - gt with  success   Submit successfully          For some reason  I keep getting this error   Call to undefined function App Http Controllers getFactorial    Can someone please teach me how to fix this error     Much appreciated in advance      CodeController php   lt  php  namespace App Http Controllers  use View  Input  Redirect   class CodeController extends Controller         public function codingPuzzle                 return View  make  codes puzzle               public static function getFactorial  num                 fact   1          for  i   1   i  lt    num   i                 fact    fact    i          return  fact              public function codingPuzzleProcess                   word       strtoupper Input  get  word              length     strlen  word            max value     length   26            characters   str split  word             num   1            index   1           sort  characters            foreach    characters as  character                 num    getFactorial  index     index               index                        return Redirect  to   coding-puzzle               - gt with  word    word               - gt with  num    num               - gt with  success   Submit successfully

User · Answer

If they are in the same controller class, it would be:

foreach ( $characters as $character) {
    $num += $this->getFactorial($index) * $index;
    $index ++;
}

Otherwise you need to create a new instance of the class, and call the method, ie:

$controller = new MyController();
foreach ( $characters as $character) {
    $num += $controller->getFactorial($index) * $index;
    $index ++;
}

User · Answer

say you define the static getFactorial function inside a CodeController  then this is the way you need to call a static function  because static properties and methods exists with in the class  not in the objects created using the class   CodeController  getFactorial  index     ----------------UPDATE----------------  To best practice I think you can put this kind of functions inside a separate file so you can maintain with more easily   to do that  create a folder inside app directory and name it as lib  you can put a name you like    this folder to needs to be autoload to do that add app lib to composer json as below  and run the composer dumpautoload command    autoload          classmap                      app commands                    app controllers                                                 app lib             then files inside lib will autoloaded   then create a file inside lib  i name it helperFunctions php  inside that define the function   if     function exists  getFactorial                      return the factorial of a number                param  number         return string             function getFactorial  date                 fact   1           for  i   1   i  lt    num   i                 fact    fact    i           return  fact              and call it anywhere within the app as   fatorial value   getFactorial 225

[php] Call to undefined function App\Http\Controllers\ [ function name ]

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