class intercept_demo{
??? private $xingming = "";
??? private $age = 10;
??
??? // 若拜訪一個未定義的屬性,則將調用get{$property}對應的方法
??? function __get($property){
??????? $method = "get{$property}";
??????? if (method_exists($this, $method)){
??????????? return $this->$method();
??????? }
??? }

??? // 若給一個未定義的屬性設置值,則將調用set{$property}對應的方法
??? function __set($property, $value){
??????? $method = "set{$property}";
??????? if (method_exists($this, $method)){
??????????? return $this->$method($value);
??????? }??
??? }
??
??? // 若用戶對未定義的屬性調用isset方法,
??? function __isset($property){
??????? $method = "isset{$property}";
??????? if (method_exists($this, $method)){
??????????? return $this->$method();
??????? }
??? }
??
??? // 若用戶對未定義的屬性調用unset方法,
??? // 則認為調用對應的unset{$property}方法
??? function __unset($property){
??????? $method = "unset{$property}";
??????? if (method_exists($this, $method)){
??????????? return $this->$method();
??????? }
??? }
??
??? function __call($method, $arg_array){
??????? if (substr($method,0,3)=="get"){
??????????? $property = substr($method,3);
??????????? $property = strtolower(substr($property,0,1)).substr($property,1);
??????????? return $this->$property;
??????? }
??? }
??
??? function testIsset(){
??????? return isset($this->Name);
??? }
??
??? function getName(){
??????? return $this->xingming;
??? }
??
??? function setName($value){
??????? $this->xingming = $value;
??? }
??
??? function issetName(){
??????? return !is_null($this->xingming);
??? }
??
??? function unsetName(){
??????? $this->xingming = NULL;
??? }
}PHP學習

$intercept = new intercept_demo();
echo "設置屬性Name為Li";
$intercept->Name = "Li";
echo "\$intercept->Name={$intercept->Name}";
echo "isset(Name)={$intercept->testIsset()}";
echo "";
echo "清空屬性Name值";
unset($intercept->Name);
echo "\$intercept->Name={$intercept->Name}";
echo "";
echo "調用未定義的getAge函數";
echo "age={$intercept->getAge()}";PHP學習