PHP collection class

<? PHP  /*  ** PHP collection class (1)  */  Error_reporting (0 );  Class  Collection {  Protected   $ _ Members = Array  ();  Public   Function Additem ( $ OBJ ,$ Key = Null  ){  If ( Empty ( $ Key )) Throw   New   Exception ("The key is not given! " );  If ( Isset ( $ This -> _ Members [ $ Key ])Throw   New   Exception ("The key is exists" );  $ This -> _ Members [ $ Key ] = $ OBJ  ;}  Public   Function Removeitem ( $ Key  ){  If (! Isset ( $ This -> _ Members [ $ Key ]) Throw   New   Exception ("Invalid key" );  Unset ( $ This -> _ Members [ $ Key  ]);}  Public   Function Getitem ( $ Key  ){  If (!Isset ( $ This -> _ Members [ $ Key ]) Throw   New   Exception ("Invalid key" );  Return   $ This -> _ Members [ $ Key  ];}  Public   Function  Getlength (){  Return  Sizeof ( $ This -> _ Members );}  Public   Function  Keys (){  Return   Array_keys ( $ This -> _ Members );}}  Class  Person {  Private   $ _ Name  ; Private   $ _ Number  ;  Public   Function _ Construct ( $ Name , $ Number  ){  $ This -> _ Name = $ Name  ;  $ This -> _ Number = $ Number  ;}  Public  Function  _ Tostring (){  Return   $ This -> _ Name. 'Is '. $ This -> _ Number ;}}  $ Testc = New  Supercollection ();  $ Testc -> Spadditem ( New Person ('xiaojiang ', 25), 'xiaojiang' );  $ Testc -> Spadditem (New Person ('xiaoxin', 25), 'xiaoxin' );  //  $ Testc-> removeitem ('xiaojiang '); // print_r ($ testc );  /*  Try {// var_dump ($ testc); // echo $ testc-> spgetitem ('xiaojiang ');} catch (exception $ E) {echo $ e-> getmessage ();}  */  Class Supercollection Extends  Collection {  Private   $ _ Isloaded = False ;  Private   $ _ Onload  ;  Public   Function _ Call ( $ Method , $ Param  ){  If ( Substr ( $ Method , 0, 2) = 'SP '&& Is_callable ( Array (Parent,Substr ( $ Method , 2 )))){  $ This -> _ Checkcallback ();  Return   Call_user_func_array ( Array (Parent, Substr ( $ Method , 2 )), $ Param  );}}  Public   Function _ Checkcallback (){  If (! $ _ Isloaded && Isset ( $ This -> _ Onload )){  $ This -> Isloaded = True  ;  Call_user_func ( $ This -> _ Onload, $ This  );}} Public   Function Setcallback ( $ Funname , $ OBJ = Null , $ Param  ){  If ( $ OBJ  ){  $ Callback = Array ( $ OBJ , $ Funname );}  Else  {  $ Callback = $ Funname  ;}  If (! Is_callable ( $ Callback , False , $ Callbackname  )){  Throw   New   Exception ("{$ Callbackname } Can't be called" );  Return   False  ;}  $ This -> _ Onload = $ Callback  ;}}  Class Course_collection Extends  Supercollection {}  Class  Course {  Private   $ _ Name ;  Private   $ _ Course_code  ;  Private   $ _ Id  ;  Function _ Construct ( $ Name , $ Code , $ ID  ){  $ This -> _ Name = $ Name  ; $ This -> _ Course_code = $ Code  ;  $ This -> _ Id = $ ID  ;}  Public   Function  GETID (){  Return   $ This -> _ Id ;}}  Class  Student {  Private  $ _ Name  ;  Private   $ _ Age  ;  Public   Function _ Construct ( $ Name , $ Age  ){  $ This -> _ Name = $ Name  ;  $ This -> _ Age = $ Age ;  $ This -> _ Course = New  Course_collection ();  $ This -> _ Course-> setcallback ('getcourse ', $ This  );}  Public   Function Getcourse ( $ Courseobj  ){  $ Date = Array  ( 'Xiaojiang '=> Array  (  Array ('Id' => 1, 'name' => 'Math', 'code' => 99 ), Array ('Id' => 2, 'name' => 'inc', 'code' => 88 )) , 'Xiaoxin' => Array  (  Array ('Id' => 3, 'name' => 'Math', 'code' => 77 ), Array ('Id' => 4, 'name' => 'inc', 'code' => 66 )));  Foreach ( $ Date [ $ This -> _ Name] As   $ K => $ V  ){  $ Course = New Course ( $ V ['Name'], $ V ['Code'],$ V ['Id' ]);  $ Courseobj -> Additem ( $ Course , $ Course -> GETID ());}}  Public   Function  Getname (){  Return   $ This -> _ Name ;}}  Try  { $ Stud = New Student ('xiaojiang ', 25 );  //  Echo $ stud-> getname ();     Print_r ( $ Stud -> _ Course-> spgetitem (2 ));}  Catch ( Exception   $ E  ){  Echo   $ E ->Getmessage ();} ?>