Is it possible to create static classes in PHP like in C

Question

I want to create a static class in PHP and have it behave like it does in C   so   Constructor is automatically called on the first call to the class No instantiation required   Something of this sort     static class Hello       private static  greeting    Hello        private   construct              greeting      There               public static greet            echo  greeting           Hello  greet       Hello There

User · Answer

you can have those  static -like classes  but i suppose  that something really important is missing  in php you don t have an app-cycle  so you won t get a real static  or singleton  in your whole application     see Singleton in PHP

User · Answer

you can have those  static -like classes  but i suppose  that something really important is missing  in php you don t have an app-cycle  so you won t get a real static  or singleton  in your whole application     see Singleton in PHP

User · Answer

In addition to Greg s answer  I would recommend to set the constructor private so that it is impossible to instantiate the class   So in my humble opinion this is a more complete example based on Greg s one    lt  php  class Hello                  Construct won t be called inside this class and is uncallable from        the outside  This prevents instantiating this class         This is by purpose  because we want a static class              private function   construct          private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

User · Answer

I generally prefer to write regular non static classes and use a factory class to instantiate single   sudo static   instances of the object   This way constructor and destructor work as per normal  and I can create additional non static instances if I wish   for example a second DB connection    I use this all the time and is especially useful for creating custom DB store session handlers  as when the page terminates the destructor will push the session to the database   Another advantage is you can ignore the order you call things as everything will be setup on demand   class Factory       static function  amp getDB   construct params   null                static  instance          if    is object  instance                          include once  clsDB php                 instance   new clsDB  construct params        constructor will be called                   return  instance            The DB class     class clsDB         regular public variables    whatever        function   construct  construct params            function   destruct              function getvar     return  this- gt regular public variables        Anywhere you want to use it just call       static instance    amp Factory  getDB  somekickoff     Then just treat all methods as non static   because they are    echo  static instance- gt getvar

User · Answer

final Class B       static  staticVar      static function getA            self   staticVar   New A            the stucture of b is calld a singeton handler you can also do it in a   Class a      static  instance      static function getA               if  isset self   staticVar                self   staticVar   New A                         return self   staticVar            this is the singleton use      a   a  getA

User · Answer

I generally prefer to write regular non static classes and use a factory class to instantiate single   sudo static   instances of the object   This way constructor and destructor work as per normal  and I can create additional non static instances if I wish   for example a second DB connection    I use this all the time and is especially useful for creating custom DB store session handlers  as when the page terminates the destructor will push the session to the database   Another advantage is you can ignore the order you call things as everything will be setup on demand   class Factory       static function  amp getDB   construct params   null                static  instance          if    is object  instance                          include once  clsDB php                 instance   new clsDB  construct params        constructor will be called                   return  instance            The DB class     class clsDB         regular public variables    whatever        function   construct  construct params            function   destruct              function getvar     return  this- gt regular public variables        Anywhere you want to use it just call       static instance    amp Factory  getDB  somekickoff     Then just treat all methods as non static   because they are    echo  static instance- gt getvar

User · Answer

you can have those  static -like classes  but i suppose  that something really important is missing  in php you don t have an app-cycle  so you won t get a real static  or singleton  in your whole application     see Singleton in PHP

User · Answer

You can have static classes in PHP but they don t call the constructor automatically  if you try and call self    construct   you ll get an error    Therefore you d have to create an initialize   function and call it in each method    lt  php  class Hello       private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

User · Answer

object cannot be defined staticly but this works  final Class B    static  var    static function init        self   var   new A      B  init

User · Answer

You can have static classes in PHP but they don t call the constructor automatically  if you try and call self    construct   you ll get an error    Therefore you d have to create an initialize   function and call it in each method    lt  php  class Hello       private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

User · Answer

object cannot be defined staticly but this works  final Class B    static  var    static function init        self   var   new A      B  init

User · Answer

In addition to Greg s answer  I would recommend to set the constructor private so that it is impossible to instantiate the class   So in my humble opinion this is a more complete example based on Greg s one    lt  php  class Hello                  Construct won t be called inside this class and is uncallable from        the outside  This prevents instantiating this class         This is by purpose  because we want a static class              private function   construct          private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

User · Answer

final Class B       static  staticVar      static function getA            self   staticVar   New A            the stucture of b is calld a singeton handler you can also do it in a   Class a      static  instance      static function getA               if  isset self   staticVar                self   staticVar   New A                         return self   staticVar            this is the singleton use      a   a  getA

User · Answer

you can have those  static -like classes  but i suppose  that something really important is missing  in php you don t have an app-cycle  so you won t get a real static  or singleton  in your whole application     see Singleton in PHP

User · Answer

You can have static classes in PHP but they don t call the constructor automatically  if you try and call self    construct   you ll get an error    Therefore you d have to create an initialize   function and call it in each method    lt  php  class Hello       private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

User · Answer

You can have static classes in PHP but they don t call the constructor automatically  if you try and call self    construct   you ll get an error    Therefore you d have to create an initialize   function and call it in each method    lt  php  class Hello       private static  greeting    Hello       private static  initialized   false       private static function initialize                 if  self   initialized              return           self   greeting      There            self   initialized   true             public static function greet                 self  initialize            echo self   greeting           Hello  greet       Hello There      gt

[php] Is it possible to create static classes in PHP (like in C#)?

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