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Understand the usage of static and const keywords in php5

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Release： 2016-07-25 09:04:36
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  2. class Counter
  3. {
  4. private static $count = 0; //Define a static property
  5. const VERSION = 2.0; //Define a constant
  6. //Constructor
  7. function __construct(){
  8. self::$count++;
  9. }
  10. //Destructor
  11. function __destruct(){
  12. self::$count--;
  13. }
  14. //Define a static method
  15. static function getCount(){
  16. return self ::$count;
  17. }
  18. }
  19. //Create an instance
  20. $c = new Counter();
  21. //Perform printing
  22. print( Counter::getCount(). "
    " ); //Use Directly enter the class name to access the static method Counter::getCount
  23. //Print the version of the class
  24. print( "Version used: " .Counter::VERSION. "
    " );
  25. ?>
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理解php5中static和const关键字用法
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