Detailed explanation of the idea of PHP chain operation
本文主要介绍了PHP实现链式操作的核心思想。本文着重讲解它的核心思想,比较直观明了。希望对大家有所帮助。
PHP 链式操作的实现
$db->where()->limit()->order();
在 Common 下创建 Database.php。
链式操作最核心的地方在于:在方法的最后 return $this;
Database.php:
<?php namespace Common; class Database{ function where($where){ return $this; //链式方法最核心的地方在于:在每一个方法之后 return $this } function order($order){ return $this; } function limit($limit){ return $this; } }
index.php:
<?php define('BASEDIR',__DIR__); //定义根目录常量 include BASEDIR.'/Common/Loader.php'; spl_autoload_register('\\Common\\Loader::autoload'); $db = new \Common\Database(); //传统的操作需要多行代码实现 //$db->where('id = 1'); //$db->where('name = 2'); //$db->order('id desc'); //$db->limit(10); //使用链式操作,一行代码解决问题 $db->where('id = 1')->where('name = 2')->order('id desc')->limit(10);
在使用链式操作时,ide(netbeans 会给出自动提示):
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