PHP的Collection集合类

2. header("Content-type:text/html; charset=utf-8");
4. class Collection{
5. private $_members=array();
6. private $_onload;
7. private $_isLoaded=false;
9. public function startLoad(){
10. $this->_checkCallback();
11. }
13. public function addItem($obj,$key=NULL){
14. $this->_checkCallback();
15. if($key){
16. if(isset($this->_members[$key])){
17. throw new Exception("Key \\"$key\\" already in use!");
18. }else{
19. $this->_members[$key]=$obj;
20. }
21. }else{
22. $this->_members[]=$obj;
23. }
24. }
26. public function removeItem($key){
27. $this->_checkCallback();
28. if(isset($this->_members[$key])){
29. unset($this->_members[$key]);
30. }else{
31. throw new Exception("Invalid key \\"$key\\"!");
32. }
33. }
35. public function getItem($key){
36. $this->_checkCallback();
37. if(isset($this->_members[$key])){
38. return $this->_members[$key];
39. }else{
40. throw new Exception("Invalid key \\"$key\\"!");
41. }
42. }
44. public function keys(){
45. $this->_checkCallback();
46. return array_keys($this->_members);
47. }
49. public function length(){
50. $this->_checkCallback();
51. return sizeof($this->_members);
52. }
54. public function exists($key){
55. $this->_checkCallback();
56. return (isset($this->_members[$key]));
57. }
59. public function setLoadCallback($functionName,$objOrClass=NULL){
60. if($objOrClass){
61. $callback=array($objOrClass,$functionName);
62. }else{
63. $callback=$functionName;
64. }
66. if(!is_callable($callback)){
67. /*throw new Exception("$callableName is not callable"."as a parameter to oonload");*/
68. echo "$callback is not callable
    ";
69. return false;
70. }
72. $this->_onload=$callback;
73. }
75. private function _checkCallback(){
76. if(isset($this->_onload)&&!$this->_isLoaded){
77. $this->_isLoaded=true;
78. call_user_func($this->_onload,$this);
79. }
80. }
81. }

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PHP, Collection