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  1. <?php
  2.  
  3. class One
  4. {
  5. 	public function do()
  6. 	{
  7. 	$xyu = Two::doTwo();
  8. 	}
  9. }
  10.  
  11.  
  12. class Two
  13. {
  14. 	public static function doTwo()
  15. 	{
  16. 	return $zalupa; 
  17. 	}
  18. }
  19.  
  20. $penis = new One;
  21. var_dump($penis->do());
Success #stdin #stdout #stderr 0.02s 82880KB
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stdin
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Standard input is empty
stdout
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NULL
stderr
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PHP Notice:  Undefined variable: zalupa in /home/gD6aa5/prog.php on line 16
https://ideone.com/mFY5q8
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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