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  1. <?php
  2.  
  3. class my_class
  4. {
  5.     public $var1;
  6.  
  7.     public $var2;
  8.  
  9.     public $var3;
  10.  
  11. 	private $data;
  12.  
  13. 	public function __construct()
  14. 	{
  15. 	    $this->data = new stdClass;
  16. 	    $this->data->var1 = 'a';
  17. 	    $this->data->var2 = 'b';
  18. 	    $this->data->var3 = 'c';
  19. 	    $this->assignReferences();
  20. 	}
  21.  
  22. 	public function makeClone()
  23. 	{
  24. 	    unset($this->var1);  // turns $this->data->var1 into non-reference
  25. 	    unset($this->var2);  // turns $this->data->var2 into non-reference
  26. 	    unset($this->var3);  // turns $this->data->var3 into non-reference
  27.  
  28. 	    $clone = clone $this;               // this code is the same
  29. 	    $clone->data = clone $clone->data;  // as what would go into
  30. 	    $clone->assignReferences();         // __clone() normally
  31.  
  32. 	    $this->assignReferences(); // undo the unset()s
  33. 	    return $clone;
  34. 	}
  35.  
  36. 	private function assignReferences()
  37. 	{
  38. 	    $this->var1 = &$this->data->var1;
  39. 	    $this->var2 = &$this->data->var2;
  40. 	    $this->var3 = &$this->data->var3;        
  41. 	}
  42. }
  43.  
  44. $original = new my_class;
  45. $new = $original->makeClone();
  46. $new->var3 = 'd'; 
  47.  
  48. echo $original->var3; // Output Should Be "c"
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
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c
https://ideone.com/k6FD0W
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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