Late/Delayed binding of the parent class and subclass in PHP

Post-binding/Delayed binding of the parent class and subclass in PHP & lt ;? Php & nbsp;/***** & nbsp; & nbsp; public welfare PHP Lecture Hall & nbsp; altar: & nbsp; http://www.zixue.it & nbsp; Micro & nbsp; blog: PHP in the parent class and subclass of the late binding/delay binding

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3. Yan 18 public welfare PHP Lecture Hall
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11. /***
12. === Note ====
13. Post-binding/Delayed binding
14. ***/
17. Class Human {
18. Public static function whoami (){
19. Echo 'whoami from parent class is being executed ';
20. }
22. Public static function say (){
23. Self: whoami (); // There is no say method in the subclass. the parent class is found here.
24. // Here self refers to the parent class
25. }
27. Public static function say2 (){
28. Static: whoami (); // The sub-class does not have the say2 method. find the parent class here.
29. // But the parent class uses static: whoami,
30. // Call your own whoami method.
31. }
32. }
35. Class Stu extends Human {
36. /*
37. Public static function whoami (){
38. Echo 'from subclass whoami is being executed ';
39. }
40. */
41. }
44. Stu: say ();
46. Stu: say2 ();