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  1. <?php
  2. header('Content-Type: text/plain');
  3. class HasFriends
  4. {
  5. 	protected $__friends = array('HasFriends');
  6.  
  7. 	public function __get($key)
  8. 	{
  9. 		$res=NULL;
  10. 		$trace = debug_backtrace();
  11. 		$frame=0;
  12. 		while($frame < count($trace) && $trace[$frame]['class']==__CLASS__) $frame++;
  13. 		if(isset($trace[$frame]['class']) && in_array($trace[$frame]['class'], $this->__friends)) {
  14. 			//return $this->$key;
  15. 			$rc=new ReflectionClass($this);
  16. 			$prop=$rc->getProperty($key);
  17. 			$prop->setAccessible(true);
  18. 			$res=$prop->getValue($this);
  19. 			return $res;
  20. 		}
  21.  
  22. 		// normal __get() code here
  23. 		throw new Exception('Cannot access private property ' . get_class($this) . '::$' . $key . "\r\n", E_USER_ERROR);
  24. 	}
  25.  
  26. 	public function __set($key, $value)
  27. 	{
  28. 		$res=NULL;
  29. 		$trace = debug_backtrace();
  30. 		$frame=0;
  31. 		while($frame < count($trace) && $trace[$frame]['class']==__CLASS__) $frame++;
  32. 		if(isset($trace[$frame]['class']) && in_array($trace[$frame]['class'], $this->__friends)) {
  33. 			//return $this->$key = $value;
  34. 			$rc=new ReflectionClass($this);
  35. 			$prop=$rc->getProperty($key);
  36. 			$prop->setAccessible(true);
  37. 			$res=$prop->setValue($this, $value);
  38. 			return $res;
  39. 		}
  40.  
  41. 		// normal __set() code here
  42. 		throw new Exception('Cannot access private property ' . get_class($this) . '::$' . $key . "\r\n", E_USER_ERROR);
  43. 	}
  44.  
  45. 	public function __call($name, $arguments)
  46. 	{
  47. 		$res=NULL;
  48. 		$trace = debug_backtrace();
  49. 		$frame=0;
  50. 		while($frame < count($trace) && $trace[$frame]['class']==__CLASS__) $frame++;
  51. 		if(isset($trace[$frame]['class']) && in_array($trace[$frame]['class'], $this->__friends)) {
  52. 			//return call_user_func_array(array($this, $name), $this->arguments);
  53. 			$rc=new ReflectionClass($this);
  54. 			$meth=$rc->getMethod($name);
  55. 			$meth->setAccessible(true);
  56. 			$res=$meth->invokeArgs($this, $arguments);
  57. 			return $res;
  58. 		}
  59. 		// normal __call() code here
  60. 		throw new Exception('Cannot call private method ' . get_class($this) . '::' . $name . '()' . "\r\n", E_USER_ERROR);
  61. 	}
  62.  
  63. 	public static function __callStatic($name, $arguments)
  64. 	{
  65. 		$trace = debug_backtrace();
  66. 		$frame=0;
  67. 		while($frame < count($trace) && $trace[$frame]['class']==__CLASS__) $frame++;
  68. 		if(isset($trace[$frame]['class']) && in_array($trace[$frame]['class'], $this->__friends)) {
  69. 			//return call_user_func_array(array(get_class($this), $name), $this->arguments);
  70. 			$rc=new ReflectionClass(get_class($this));
  71. 			$meth=$rc->getMethod($name);
  72. 			$meth->setAccessible(true);
  73. 			$res=$meth->invokeArgs(NULL, $arguments);
  74. 			return $res;
  75. 		}
  76. 		// normal __callStatic() code here
  77. 		throw new Exception('Cannot call static private method ' . get_class($this) . '::' . $name . '()' . "\r\n", E_USER_ERROR);
  78. 	}
  79. };
  80. class A extends HasFriends
  81. {
  82.  
  83. 	public $a = 1;
  84. 	protected $b = 2;
  85. 	private $c = 3;
  86. 	protected $__friends = array('B');
  87. 	private function d() { return 4; }
  88. };
  89. class B
  90. {
  91. 	public $d = 4;
  92. 	protected $e = 5;
  93. 	private $f = 6;
  94. 	public $a = NULL;
  95. 	public function getC()
  96. 	{
  97. 		return $this->a->c;
  98. 	}
  99. 	public function g() { return $this->a->d(); }
  100. };
  101. $a = new A();
  102. $b = new B();
  103. $b->a = &$a;
  104. echo 'var_dump($a)='."\r\n";
  105. var_dump($a);
  106. echo 'var_dump($b)='."\r\n";
  107. var_dump($b);
  108. try
  109. {
  110. 	echo 'Trying to access A::c'."\r\n";
  111. 	var_dump($a->c);
  112. }
  113. catch(Exception $e)
  114. {
  115. 	echo $e->getMessage();
  116. }
  117. try
  118. {
  119. 	echo 'Trying to access B::a::c'."\r\n";
  120. 	var_dump($b->a->c);
  121. }
  122. catch(Exception $e)
  123. {
  124. 	echo $e->getMessage();
  125. }
  126. echo 'Accessing B::getC(), which returns B::a::c'."\r\n";
  127. var_dump($b->getC());
  128. try
  129. {
  130. 	echo 'Trying to access A::d()'."\r\n";
  131. 	var_dump($a->d());
  132. }
  133. catch(Exception $e)
  134. {
  135. 	echo $e->getMessage();
  136. }
  137. echo 'Accessing B::g(), which returns B::a::d()'."\r\n";
  138. var_dump($b->g());
  139.  
Success #stdin #stdout 0.02s 23696KB
comments (?)
stdin 
Standard input is empty
stdout 
var_dump($a)=
object(A)#1 (4) {
  ["a"]=>
  int(1)
  ["b":protected]=>
  int(2)
  ["c":"A":private]=>
  int(3)
  ["__friends":protected]=>
  array(1) {
    [0]=>
    string(1) "B"
  }
}
var_dump($b)=
object(B)#2 (4) {
  ["d"]=>
  int(4)
  ["e":protected]=>
  int(5)
  ["f":"B":private]=>
  int(6)
  ["a"]=>
  &object(A)#1 (4) {
    ["a"]=>
    int(1)
    ["b":protected]=>
    int(2)
    ["c":"A":private]=>
    int(3)
    ["__friends":protected]=>
    array(1) {
      [0]=>
      string(1) "B"
    }
  }
}
Trying to access A::c
Cannot access private property A::$c
Trying to access B::a::c
Cannot access private property A::$c
Accessing B::getC(), which returns B::a::c
int(3)
Trying to access A::d()
Cannot call private method A::d()
Accessing B::g(), which returns B::a::d()
int(4)
https://ideone.com/G8gPRq
test friends
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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