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Three classes summarize the five design patterns of PHP

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Release： 2016-07-25 09:06:46
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Factory pattern
Single element mode
Observer mode
Command chain mode
Strategy Mode
  1. class people {
  2. private $name = '';
  3. private $user = null;
  5. private function __contract($name){/*The private definition here assists in the implementation of single element mode*/
  6. $this-> ;name = $name;
  7. }
  9. public static function instance($name){/*This method implements factory mode*/
  10. static $object = null;/*This variable implements single element mode*/
  11. if (is_null( $object))
  12. $object = new people($name);
  13. return $object;
  14. }
  16. public function work_in($who=null)
  17. {
  18. if (is_null($who)) echo 'error';
  19. else {
  20. $this->user[] = $who;/*This array variable implements the observer pattern*/
  21. echo $who->work();/*This method call implements the strategy pattern*/
  22. }
  23. }
  25. public function on_action($which=''){
  26. if (empty($which)) echo 'error';
  27. else {
  28. foreach ($this->user as $user)
  29. $user-> action($which);/*This method calls to implement the command chain mode*/
  30. }
  31. }
  32. }
  34. $people = people::instance('jack');
  35. $people->work_in(new student);
  36. $people->work_in(new teacher);
  37. $people->on_action('eat');
  39. class student {
  40. function work(){
  41. echo '
    I am a student, heading towards Nine to five. ';
  42. }
  44. function action($which){
  45. if (method_exists($this, $which)) return $this->$which();
  46. else echo 'you are wrong!';
  47. }
  49. function eat(){
  50. echo '
    I am a student and can only eat set meals. ';
  51. }
  52. }
  54. class teacher {
  55. function work(){
  56. echo '
    I am a teacher, and I am busiest in the evening preparing lessons. ';
  57. }
  59. function action($which){
  60. if (method_exists($this, $which)) return $this->$which();
  61. else echo 'i can not do it!';
  62. }
  64. function eat(){
  65. echo '
    I am a teacher and can eat big meals every day. ';
  66. }
  67. }
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三个类概括PHP的五种设计模式
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