PHP實例
<?php
 
class Magic
{
  public $var = 'test';
 
  //構造函數,在創建對象的時候調用
  public function __construct()
  {
    echo '__construct called'.PHP_EOL;
  }
 
  //某個對象的引用都被刪除、對象被銷毀、調用exit()后、腳本關閉時被調用
  public function __destruct()
  {
    echo '__destruct called'.PHP_EOL;
  }
 
  //當給不可拜訪或不存在屬性賦值時被調用
  public function __set($name, $value)
  {
    echo $name.'-'.$value;
    echo '__set called'.PHP_EOL;
  }
 
  //讀取不可拜訪或不存在屬性時被調用
  public function __get($name)
  {
    echo $name;
    echo '__get called'.PHP_EOL;
  }
 
  //調用不可拜訪或不存在的方法時被調用
  public function __call($name, $arguments)
  {
    echo $name . '-' . implode(',', $arguments);
    echo '__call called'.PHP_EOL;
  }
 
  //調用不可拜訪或不存在的靜態方法時被調用
  public static function __callStatic($name, $arguments)
  {
    echo $name . '-' . implode(',', $arguments);
    echo '__callStatic called'.PHP_EOL;
  }
 
  //對不可拜訪或不存在的屬性調用isset()或empty()時被調用
  public function __isset($name)
  {
    echo $name;
    echo '__isset called'.PHP_EOL;
    return true;
  }
 
  //對不可拜訪或不存在的屬性進行unset時被調用
  public function __unset($name)
  {
    echo $name;
    echo '__unset called'.PHP_EOL;
  }
 
  //serialize時被調用,當你不需要保存大對象的所有數據時很有用
  public function __sleep()
  {
    echo '__sleep called'.PHP_EOL;
    return array('var1111111111');
  }
 
  //unserialize時被調用,可用于做些對象的初始化操作
  public function __wakeup()
  {
    echo '__wakeup called'.PHP_EOL;
    $this->var = 'test after wakeup';
  }
 
  //當一個類被轉換成字符串時被調用
  public function __toString()
  {
    return '__toString called'.PHP_EOL;
  }
 
  //進行對象clone時被調用,用來調整對象的克隆行為
  public function __clone()
  {
    echo '__clone called'.PHP_EOL;
  }
 
  //當以函數方式調用對象時被調用
  public function __invoke()
  {
    echo '__invoke called'.PHP_EOL;
  }
 
  //當調用var_export()導出類時,此靜態方法被調用.用__set_state的返回值做為var_export的返回值.
  public static function __set_state($arr)
  {
    return '__set_state called'.PHP_EOL;
  }
 
  //當調用var_dump()打印對象時被調用(當你不想打印所有屬性)適用于PHP5.6版本
  public function __debuginfo($arr)
  {
    echo '__debuginfo called'.PHP_EOL;
    return array(
      'var' => 'test fro __debuginfo'
    );
  }
}
 
$m = new Magic(); //__construct()被調用
$m->not_exist_property = test; //__set()被調用
echo $m->not_exist_property;//__get()被調用
$m->abc(1,2,3); //__call()被調用
echo isset($m->not_exist_property); //__isset()被調用,返回bool值
unset($m->not_exist_property); //__unset()被調用
echo $tmp = serialize($m); //__sleep()被調用
unserialize($tmp); //__wakeup()被調用
$m1 = clone $m; //__clone()被調用,對象默認是引用傳遞,使用clone關鍵詞則可實現對象復制
$m(); //__invoke()
eval( '$m2 = ' . var_export ( $m , true ) . ';' );var_dump($m2);
var_dump($m);
//最后__destruct()被調用
 
/*
結果：
__construct called
not_exist_property-test__set called
not_exist_property__get called
abc-1,2,3__call called
not_exist_property__isset called
1not_exist_property__unset called
__sleep called
O:5:"Magic":1:{s:13:"var1111111111";N;}__wakeup called
__destruct called
__clone called
__invoke called
string(20) "__set_state called
"
class Magic#1 (1) {
 public $var =>
 string(4) "test"
}
__destruct called
__destruct called
 
 
*/