PHP Collection 类

<?php
/**
 * PHP collection 类(一) 
 */
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){
        
      $date = array(
                        "xiaojiang"=> array(
                                              array("id"=>1,"name"=>"math","code"=>99),
                                              array("id"=>2,"name"=>"english","code"=>88)
                                            ),
                        "xiaoxin"=> array(
                                              array("id"=>3,"name"=>"math","code"=>77),
                                              array("id"=>4,"name"=>"english","code"=>66)
                                           )
                     );
        foreach($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();
}
?>