Call to a member function on a non-object

Question

So I m refactoring my code to implement more OOP   I set up a class to hold page attributes   class PageAtrributes      private  db connection    private  page title       public function   construct  db connection                  this- gt db connection    db connection           this- gt page title                  public function get page title                 return  this- gt page title             public function set page title  page title                 this- gt page title    page title            Later on I call the set page title   function like so  function page properties  objPortal             objPage- gt set page title  myrow  title         When I do I receive the error message      Call to a member function set page title   on a non-object   So what am I missing

User · Answer

function page properties  objPortal             objPage- gt set page title  myrow  title         looks like different names of variables  objPortal vs  objPage

User · Answer

There s an easy way to produce this error        joe   null       joe- gt anything      Will render the error      Fatal error  Call to a member function anything   on a non-object in  Applications XAMPP xamppfiles htdocs casMail dao server php on line 23   It would be a lot better if PHP would just say       Fatal error   Call from Joe is not defined because  a  joe is null or  b  joe does not define anything   in  on line  lt        Usually you have build your class so that  joe is not defined in the constructor or

User · Answer

It means that  objPage is not an instance of an object   Can we see the code you used to initialize the variable   As you expect a specific object type  you can also make use of PHPs type-hinting featureDocs to get the error when your logic is violated   function page properties PageAtrributes  objPortal                     objPage- gt set page title  myrow  title         This function will only accept PageAtrributes for the first parameter

User · Answer

I realized that I wasn t passing  objPage into page properties     It works fine now

User · Answer

Either  objPage is not an instance variable OR your are overwriting  objPage with something that is not an instance of class PageAttributes

User · Answer

It could also mean that when you initialized your object  you may have re-used the object name in another part of your code  Therefore changing it s aspect from an object to a standard variable    IE   game   new game    game- gt doGameStuff  gameReturn    foreach  gameArray as  game        game  STUFF       No longer an object and is now a standard variable pointer for  game        game- gt doGameStuff  gameReturn       Wont work because  game is declared as a standard variable   You need to be careful when using common variable names and were they are declared in your code

User · Answer

you can use  use  in function like bellow example  function page properties  objPortal  use  objPage            objPage- gt set page title  myrow  title

User · Answer

I recommend the accepted answer above   If you are in a pinch  however  you could declare the object as a global within the page properties function    objPage   new PageAtrributes   function page properties         global  objPage       objPage- gt set page title  myrow  title

[php] Call to a member function on a non-object

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