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  1. <?php
  2.  
  3. // your code goes here
  4.  
  5. class Application {
  6.     static $db_connected = false;
  7. }
  8.  
  9. class Database extends Application {
  10.     function connect() {
  11.         if(!static::$db_connected) {
  12.             static::$db_connected = true;
  13.         }
  14.     }
  15. }
  16.  
  17. $app = new Application;
  18. $db = new Database;
  19.  
  20. var_dump(Application::$db_connected);
  21. var_dump(Database::$db_connected);
  22.  
  23. $db->connect();
  24.  
  25. var_dump(Application::$db_connected);
  26. var_dump(Database::$db_connected);
Success #stdin #stdout 0.01s 20520KB
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bool(false)
bool(false)
bool(true)
bool(true)
https://ideone.com/97vQuF
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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