PHP class Global variable as property in class

Question

I have a global variable outside my class    MyNumber    How do I declare this as a property in myClass  For every method in my class  this is what I do   class myClass          private function foo               privateNumber    GLOBALS  MyNumber                I want this  class myClass            What goes here      var  classNumber        the global  MyNumber       private function foo               privateNumber    this- gt classNumber               EDIT  I want to create a variable based on the global  MyNumber but  modified before using it in the methods   something like  var  classNumber   global  MyNumber   100

User · Answer

Simply use the global keyword   e g    class myClass         private function foo             global  MyNumber                 MyNumber will then become accessible  and indeed modifyable  within that method    However  the use of globals is often frowned upon  they can give off a bad code smell   so you might want to consider using a singleton class to store anything of this nature   Then again  without knowing more about what you re trying to achieve this might be a very bad idea - a define could well be more useful

User · Answer

You probably don t really want to be doing this  as it s going to be a nightmare to debug  but it seems to be possible   The key is the part where you assign by reference in the constructor    GLOBALS   array       MyNumber    gt  1     class Foo       protected  glob       public function   construct             global  GLOBALS           this- gt glob   amp   GLOBALS             public function getGlob             return  this- gt glob  MyNumber              f   new Foo   echo  f- gt getGlob       n    GLOBALS  MyNumber     2  echo  f- gt getGlob       n     The output will be   1 2   which indicates that it s being assigned by reference  not value   As I said  it will be a nightmare to debug  so you really shouldn t do this   Have a read through the wikipedia article on encapsulation  basically  your object should ideally manage its own data and the methods in which that data is modified  even public properties are generally  IMHO  a bad idea

User · Answer

What I ve experienced is that you can t assign your global variable to a class variable directly   class myClass          public  var    GLOBALS  variable         public function func              var dump  this- gt var             With the code right above  you get an error saying  Parse error  syntax error  unexpected   GLOBALS    But if we do something like this   class myClass          public  var   array         public function   construct              this- gt var    GLOBALS  variable               public function func              var dump  this- gt var              Our code will work fine   Where we assign a global variable to a class variable must be inside a function  And I ve used constructor function for this   So  you can access your global variable inside the every function of a class just using  this- var

User · Answer

If you want to access a property from inside a class you should   private  classNumber   8

User · Answer

class myClass        protected  foo   public function   construct  amp  var         this- gt foo    amp  var     public function foo         return    this- gt foo

User · Answer

What about using constructor   class myClass        myNumber   NULL      public function   construct           global myNumber          this- gt myNumber    amp myNumber            public function foo           echo  this- gt myNumber            Or much better this way  passing the global variable as parameter when inicializin the object - read only   class myClass        myNumber   NULL      public function   construct  myNumber           this- gt myNumber    myNumber            public function foo           echo  this- gt myNumber           instance   new myClass  myNumber

User · Answer

Try to avoid globals  instead you can use something like this  class myClass      private  myNumber    public function setNumber  number       this- gt myNumber    number         Now you can call   class   new myClass     class- gt setNumber  1234

[php] PHP class: Global variable as property in class

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