PHP design Mode Preparation Chapter

To understand the design pattern first we need to understand the PHP namespace and the automatic loading of the class function

Let's take a look here.

Name space

Concept reason: such as a a.php article but we need two of the same directory at this time cannot exist two a.php then we can put in My/home and my/home1 directory, the namespace has its meaning

Then the space is my/home/a.php.

namespace My\name;

Demo

So here's the problem with automatic loading.

The simplest automatic loading is

function __autoload ($class) {  $dir = './';  Set_include_path (Get_include_path (). Path_separator. $ids _dir);  $class = str_replace (' \ ', '/', $class). '. php ';   Require_once ($class); }

But with __autoload () This method is out.

Now we're using more of the Spl_autoload_register (advantage)

The interview may be designed to

Contrast:

1. Spl_autoload_register can make multiple write-registered load functions, and whoever registers first is called first, but _autoload () can only be called once

2.spl_autoload_register can catch errors

3. Since we can register then we can also use Spl_autoload_unregister () to cancel the registration.

Through the above study we can carry out a PSR schema processing

PSR Concept:

1. PSR-0 specification

[1] namespace must be consistent with absolute path

[2] class name first letter must be capitalized

[3] Except for the entry file, the other ". PHP" must have only one class

[4]php class files must be loaded automatically, not include, etc.

[5] Single inlet

2. Case

[1] directory structure

[2] Source code

index.php

!--? phpdefine (' Basedie ', __dir___); require_once ('/config/loader.php '); spl_autoload (' \ \ \ Config\\loader.php::autoload '); Config\object::test ();    App\home\index::test ();     
 Config/object.php 
    
!--? phpnamespace config;class object{static function test () {echo "Nihao";}}     
 Config/loader.php 
 
!--? phpnamespace config;class loader{static function AutoLoad ($class) {require_once (Basedie .' /config/'. Str_replace (' \ \ ', '/', $class). php '); }}  
 app/home/index.php 
 
!--? phpnamespace app\home;class index{static func tion Test () {echo "Ceshixinxi";}} 
 
 
 
 