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PHP的Collection集合类

时间：2021-07-01 10:21:17 帮助过：4人阅读

  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. }

PHP, Collection

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