php - Instantiating objects for use in static accessors -

background

i have 2 classes, , b, class full of static methods (behat/mink step definitions), using logic methods instance of class b.

what want have class able use methods instance of b, have no constructor.

class {     // class needs instance of b, has no constructor      const b_instance = new b(); //surely not? }  class b {     public function __construct() {}      public function methodforuseinclassa() {...} } 

nuance

right now, have extending b, unit testing purposes, instantiating b better solution.

question

how can facilitate this? there accepted best practice this?

any tips appreciated!

either try extend class extends b {}, you'll have access methods of b. or try one:

class {     //this class needs instance of b, has no constructor     private static $instanceofb = null;      // singleton returns same object while script running     public static function getinstanceofb() {         if( self::$instanceofb === null ) {             self::$instanceofb = new b();         }          return self::$instanceofb;     }      // returns new instance     public static function getnewinstanceofb() {         return new b();     } }  class b {     public function __construct() {}      public function methodforuseinclassa() {         //     }  } 

you can call this, think extending better option, except need static helper methods.

$b = a::getinstanceofb(); $b->methodforuseinclassa();