PHP class automatic loading, chain operation, magic method implementation code_php skills

墨辰丷
Release: 2023-03-26 18:46:02
Original
1517 people have browsed it

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__.&#39;<br>&#39;;
    echo __FILE__.&#39;<br>&#39;;
  }
}
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index.php内容

<?php
include "load.php";
Tests\Test1::test();
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load.php内容

<?php
class Loader
{
  static function loadClass($class)
  {
    $class =  __DIR__.DIRECTORY_SEPARATOR.str_replace(&#39;\\&#39;,&#39;/&#39;,$class).&#39;.php&#39;;
    if (file_exists($class)) {
      include $class;
      return;
    }
  }
}
spl_autoload_register(array(&#39;Loader&#39;,&#39;loadClass&#39;));
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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(&#39;id = 1&#39;)->order(&#39;order by id&#39;)->limit(1);
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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 &#39;magic function&#39;;
 }
 
 static function __callstatic($func, $param) {
  //var_dump($func, $param);
  return &#39;magic static function&#39;;
 }
 
 function __toString(){
  return __CLASS__;
 }
 
 function __invoke($param) {
  return var_dump($param);
 }
 
}
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$obj = new baobab\Object();
$obj->title = &#39;hello&#39;;
echo $obj->title;
echo $obj->test1(&#39;hello&#39;, 123);
echo $obj::test1(&#39;hello1&#39;, 1234);
echo $obj;
echo $obj(&#39;test1&#39;);
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相关推荐:

PHP魔术方法之__call与__callStatic如何使用

php魔术方法

php魔术常量介绍和魔术函数使用代码说明总结

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