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  1. <?php
  2.  
  3. class Cd
  4. {
  5. 	public $name;
  6.  
  7.     public function __construct($a)
  8.     {
  9.         $this->name = $a;
  10.     }
  11. }
  12.  
  13. $a=new Cd(1);
  14.  
  15. $b=$a;
  16.  
  17. echo "$a->name\n";
  18. unset($a);
  19.  
  20. if(isset($a))
  21.   echo "live a\n";
  22. else
  23. 	echo "die a\n";
  24.  
  25.  
  26. if(isset($b))
  27.   echo "live b\n";
  28. else
  29. 	echo "die b\n";
  30.  
  31. echo "$b->name\n";
  32.  
  33. var_dump($a);
  34. var_dump($b);
Success #stdin #stdout #stderr 0.02s 24448KB
comments (?)
stdin 
Standard input is empty
stdout 
1
die a
live b
1
NULL
object(Cd)#1 (1) {
  ["name"]=>
  int(1)
}
stderr 
PHP Notice:  Undefined variable: a in /home/WX1Kk9/prog.php on line 33
https://ideone.com/qbhspj
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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