__sleep()、__wakeup() 魔术方法与异常处理

1. __sleep()与__wakeup()

//__sleep()：当序列化的时候自动调用
//__wakeup()：当反序列化的时候自动调用
class Product
{
    public $name;
    private $price,$sum;
    public function __construct($name,$price,$sum)
    {
        $this->name=$name;
        $this->price=$price;
        $this->sum=$sum;
    }
    //序列化时自动调用，return array()返回序列化的值
    public function __sleep()
    {
        return array('sum','price');
    }
    //反序列化时自动调用
    public function __wakeup()
    {
        $this->total=$this->price*$this->sum;
    }
}
$product=new Product('手机',1000,3); 
$res = serialize($product); //序列化
$str = unserialize($res);   //反序列化
printf('<pre>%s</pre>',print_r($str,true));

图例

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2.异常处理类

自定义异常类

<?php
class CustomException extends Exception
{
    public function __toString()
    {
        return '错误提醒：'.$this->message.'<br>'.'代码异常：'.$this->code;
    }
}
class Custom
{
    public $admin;
    public function __construct($admin)
    {   
        $this->admin = $admin;
    }
}
try
{   
    $custom = new Custom('12345678qq.com');
    if(!filter_var($custom->admin,FILTER_VALIDATE_EMAIL))
    {
        throw new CustomException('邮箱格式不正确',30);
    }else
    {
        echo '验证成功';
    }
}
catch(CustomException $e)
{
    echo $e;
}

匿名类

var_dump((new  class('user1','123')
{
    public $admin,$password;
    public function __construct($admin,$password)
    {
        $this->admin = $admin;
        $this->password = $password;
    }
}));

总结

了解了如何自定义一个异常, __sleep和__wakeup都用在对象的序列化操作,关于匿名类没有想到什么好的例子，只能写一个最简单的了。