php面向对象中的魔术方法实例汇总

<?php
 
class Magic
{
  public $var = &#39;test&#39;;
 
  //构造函数,在创建对象的时候调用
  public function construct()
  {
    echo &#39;construct called&#39;.PHP_EOL;
  }
 
  //某个对象的引用都被删除、对象被销毁、调用exit()后、脚本关闭时被调用
  public function destruct()
  {
    echo &#39;destruct called&#39;.PHP_EOL;
  }
 
  //当给不可访问或不存在属性赋值时被调用
  public function set($name, $value)
  {
    echo $name.&#39;-&#39;.$value;
    echo &#39;set called&#39;.PHP_EOL;
  }
 
  //读取不可访问或不存在属性时被调用
  public function get($name)
  {
    echo $name;
    echo &#39;get called&#39;.PHP_EOL;
  }
 
  //调用不可访问或不存在的方法时被调用
  public function call($name, $arguments)
  {
    echo $name . &#39;-&#39; . implode(&#39;,&#39;, $arguments);
    echo &#39;call called&#39;.PHP_EOL;
  }
 
  //调用不可访问或不存在的静态方法时被调用
  public static function callStatic($name, $arguments)
  {
    echo $name . &#39;-&#39; . implode(&#39;,&#39;, $arguments);
    echo &#39;callStatic called&#39;.PHP_EOL;
  }
 
  //对不可访问或不存在的属性调用isset()或empty()时被调用
  public function isset($name)
  {
    echo $name;
    echo &#39;isset called&#39;.PHP_EOL;
    return true;
  }
 
  //对不可访问或不存在的属性进行unset时被调用
  public function unset($name)
  {
    echo $name;
    echo &#39;unset called&#39;.PHP_EOL;
  }
 
  //serialize时被调用，当你不需要保存大对象的所有数据时很有用
  public function sleep()
  {
    echo &#39;sleep called&#39;.PHP_EOL;
    return array(&#39;var1111111111&#39;);
  }
 
  //unserialize时被调用，可用于做些对象的初始化操作
  public function wakeup()
  {
    echo &#39;wakeup called&#39;.PHP_EOL;
    $this->var = &#39;test after wakeup&#39;;
  }
 
  //当一个类被转换成字符串时被调用
  public function toString()
  {
    return &#39;toString called&#39;.PHP_EOL;
  }
 
  //进行对象clone时被调用，用来调整对象的克隆行为
  public function clone()
  {
    echo &#39;clone called&#39;.PHP_EOL;
  }
 
  //当以函数方式调用对象时被调用
  public function invoke()
  {
    echo &#39;invoke called&#39;.PHP_EOL;
  }
 
  //当调用var_export()导出类时，此静态方法被调用。用set_state的返回值做为var_export的返回值。
  public static function set_state($arr)
  {
    return &#39;set_state called&#39;.PHP_EOL;
  }
 
  //当调用var_dump()打印对象时被调用（当你不想打印所有属性）适用于PHP5.6版本
  public function debuginfo($arr)
  {
    echo &#39;debuginfo called&#39;.PHP_EOL;
    return array(
      &#39;var&#39; => &#39;test fro debuginfo&#39;
    );
  }
}
 
$m = new Magic(); //construct()被调用
$m->not_exist_property = test; //set()被调用
echo $m->not_exist_property;//get()被调用
$m->abc(1,2,3); //call()被调用
echo isset($m->not_exist_property); //isset()被调用，返回bool值
unset($m->not_exist_property); //unset()被调用
echo $tmp = serialize($m); //sleep()被调用
unserialize($tmp); //wakeup()被调用
$m1 = clone $m; //clone()被调用，对象默认是引用传递，使用clone关键词则可实现对象复制
$m(); //invoke()
eval( &#39;$m2 = &#39; . var_export ( $m , true ) . &#39;;&#39; );var_dump($m2);
var_dump($m);
//最后destruct()被调用
 
/*
结果：
construct called
not_exist_property-testset called
not_exist_propertyget called
abc-1,2,3call called
not_exist_propertyisset called
1not_exist_propertyunset 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
 
 
*/