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PHP5 Singleton Class

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Actually Singleton Class in PHP5 is very easy.
Usage:

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  1. //PHP5 only
  2.  
  3. class singleton_helper
  4. {
  5.    var $__x = array();
  6.    public static function singleton()
  7.    {
  8.       static $class = null;
  9.       if($class == null)
  10.       {
  11.          $c = __CLASS__;
  12.          $class = new $c;
  13.       }
  14.       return $class;
  15.    }
  16.    function __construct(){}
  17.  
  18.    function __get($name)
  19.    {
  20.        $name = strtolower($name);
  21.        if(isset($this->__x[$name]))
  22.        {
  23.           return $this->__x[$name];
  24.        }
  25.    }
  26.  
  27.    function __set($name,$val)
  28.    {
  29.        $this->__x[strtolower($name)] = $val;
  30.    }
  31.  
  32.    function __isset($name)
  33.    {
  34.       return isset($this->__x[strtolower($name)]);
  35.    }
  36. }
  37.  
  38. class singleton
  39. {
  40.    var $____variable;
  41.    function __construct()
  42.    {
  43.       $name = get_class($this);
  44.       if(!isset(singleton_helper::singleton()->{$name}))
  45.       {
  46.          singleton_helper::singleton()->{$name} = new singleton_helper();
  47.       }
  48.       $this->____variable = &singleton_helper::singleton()->{$name};
  49.    }
  50.  
  51.    function __set($name,$value)
  52.    {
  53.        $this->____variable->$name = $value;
  54.    }
  55.  
  56.    function __get($name)
  57.    {
  58.       return $this->____variable->$name;
  59.    }
  60.  
  61.    function __isset($name)
  62.    {
  63.       return isset($this->____variable->$name);
  64.    }
  65. }
  66.  
  67. //Unit Test Bellow
  68. class singleton_x extends singleton
  69. {
  70.    function __cunstruct()
  71.    {
  72.       parent::__construct();
  73.    }
  74.  
  75.    function test()
  76.    {
  77.       return 'test';
  78.    }	  
  79. }
  80.  
  81. class singleton_y extends singleton_x
  82. {
  83.    function __cunstruct()
  84.    {
  85.       parent::__construct();
  86.    }
  87. }
  88.  
  89. class TestOfSingleton extends UnitTestCase
  90. {
  91.    function __construct()
  92.    {
  93.       $this->UnitTestCase();
  94.    }
  95.  
  96.    function test_one()
  97.    {
  98.        $test1 = new singleton_x();
  99. 	   $test1->a = 1;	   
  100.        $this->assertEqual(1,$test1->a);
  101.  
  102. 	   $test2 = new singleton_x();       
  103. 	   $this->assertEqual(1,$test2->a);
  104.  
  105. 	   $test2->a = 'abc';
  106. 	   $this->assertEqual('abc',$test1->a);
  107.    }
  108.  
  109.    function test_two()
  110.    {
  111.        $test1 = new singleton_y();
  112. 	   $test1->a = 1;	   
  113.        $this->assertEqual(1,$test1->a);
  114.  
  115. 	   $test2 = new singleton_y();       
  116. 	   $this->assertEqual(1,$test2->a);
  117.  
  118. 	   $this->assertEqual('test',$test1->test());
  119.    }
  120. }

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