php原型模式(prototype pattern)

练练练，计划上午练完创建型设计模式。

<?php
/*
The prototype pattern replicates other objects by use of cloning. What this means
is that we are not using the  new keyword to instantiate new objects. PHP provides
a  clone keyword which makes a shallow copy of an object, thus providing pretty
much straight forward prototype pattern implementation. Shallow copy does not
copy references, only values to the new object. We can further utilize the magic
__clone method on our class in order to implement more robust clone behavior.
*/

class User {
    public $name;
    public $email;
}

class Employee extends User {
    public function __construct() {
        $this->name = 'John Doe';
        $this->email = 'John.doe@fake.com';
    }

    public function info() {
        return sprintf('%s, %s <br/>', $this->name, $this->email);
    }

    public function __clone() {
        echo 'Employee__clone<br/>';
    }
}

$employee = new Employee();
echo $employee->info();

$director = clone $employee;
$director->name = 'Jane Doe';
$director->email = 'Jane.doe@fake.com';
echo $director->info();

?>

输出