PHP魔术方法使用方法汇总

//构造函数,在创建对象的时候调用
public function construct()
{
echo 'construct called'.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 'destruct called'.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 $name.'-'.$value;
echo 'set called'.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 'get called'.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 $name . '-' . implode(',',$arguments);
echo 'call called'.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 'callStatic called'.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 'isset called'.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 'unset called'.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 'sleep called'.PHP_EOL;
return array('var2222222222');
}

//unserialize时被调用，可用于做些对象的初始化操作
public function wakeup()
{
echo 'wakeup called'.PHP_EOL;
$this->var = 'test after wakeup';
}

//当一个类被转换成字符串时被调用
public function toString()
{
return 'toString called'.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 'clone called'.PHP_EOL;
}

//当以函数方式调用对象时被调用
public function invoke()
{
echo 'invoke called'.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 '__set_state called'.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 'debuginfo called'.PHP_EOL;
return array(
'var' => 'test fro __debuginfo'
);
}
}

$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
$m(); //invoke()
eval( '$m2 = ' . var_export ( $m,true ) . ';' );var_dump($m2);
var_dump($m);
//最后__destruct()被调用

/*
结果：
construct called
not_exist_property-testset called
not_exist_propertyget called
abc-1,3call called
not_exist_propertyisset called
1not_exist_propertyunset called
sleep called
O:5:"Magic":1:{s:13:"var2222222222";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

*/