


Code examples of automatic loading and chaining operations of classes and magic methods in PHP
这篇文章主要介绍了php类自动装载、链式操作、魔术方法,需要的朋友可以参考下
1、自动装载实例
目录下有3个文件:index.php load.php tests文件夹
tests文件夹里有 test1.php
<?php namespace Tests; class Test1{ static function test(){ echo __CLASS__.'<br>'; echo __FILE__.'<br>'; } }
index.php内容
<?php include "load.php"; Tests\Test1::test();
load.php内容
<?php class Loader { static function loadClass($class) { $class = __DIR__.DIRECTORY_SEPARATOR.str_replace('\\','/',$class).'.php'; if (file_exists($class)) { include $class; return; } } } spl_autoload_register(array('Loader','loadClass'));
2、php 链式操作
namespace Baobab; class Database{ function where($where){ return $this; } function order($order) { return $this; } function limit($limit){ return $this; } } ?> //index.php $db = new Baobab\Database(); $db->where('id = 1')->order('order by id')->limit(1);
3、魔术方法:
__get/__set:接管对象属性。在给不可访问属性赋值时,
__set() 会被调用;读取不可访问属性的值时,__get() 会被调用。
__call/__callStatic:在对象中调用一个不可访问方法时,__call() 会被调用;用静态方式中调用一个不可访问方法时,__callStatic() 会被调用。
__toString:一个类转化成字符串
__invoke:以调用函数的方式调用一个对象时,__invoke() 方法会被自动调用。
<?php namespace Baobab; class Object{ protected $array = array(); function __set($key, $value){ $this->array[$key] = $value; } function __get($key){ //echo __METHOD__; return $this->array[$key]; } function __call($func, $param){ //var_dump($func,$param); return 'magic function'; } static function __callstatic($func, $param) { //var_dump($func, $param); return 'magic static function'; } function __toString(){ return __CLASS__; } function __invoke($param) { return var_dump($param); } }
$obj = new baobab\Object(); $obj->title = 'hello'; echo $obj->title; echo $obj->test1('hello', 123); echo $obj::test1('hello1', 1234); echo $obj; echo $obj('test1');
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