面试时间:2018 年 9 月 21 日,星期五,下午三点。
单例模式
final class Singleton
{
/**
* @var Singleton
*/
private static $instance;
/**
* gets the instance via lazy initialization (created on first usage)
*/
public static function getInstance(): Singleton
{
if (null === static::$instance) {
static::$instance = new static();
}
return static::$instance;
}
/**
* is not allowed to call from outside to prevent from creating multiple instances,
* to use the singleton, you have to obtain the instance from Singleton::getInstance() instead
*/
private function __construct()
{
}
/**
* prevent the instance from being cloned (which would create a second instance of it)
*/
private function __clone()
{
}
/**
* prevent from being unserialized (which would create a second instance of it)
*/
private function __wakeup()
{
}
}
https://github.com/domnikl/DesignPatternsPHP/blob/master/Creational/Singleton/Singleton.php
https://phptherightway.com/pages/Design-Patterns.html
https://stackoverflow.com/questions/203336/creating-the-singleton-design-pattern-in-php5
MySQL 分区表
https://www.jianshu.com/p/89311703b320
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