Php design mode factory, Singleton, registration tree mode, php design mode

Php design mode factory, Singleton, registration tree mode, php design mode

Source Code Pro font easyphp

Namespace: Isolate classes and functions, after php5.3

// Test5.php
<? Phpnamespace Test5; // The namespace must be the first statement of the program script, except for declarefunction test () {echo _ FILE __;}

//test6.php
<?phpnamespace Test6;function test(){    echo __FILE__;}

<?php
require 'test5.php';require 'test6.php';Test5\test();Test6\test();

Class automatically loaded: After php5.2

spl_autoload_register('autoload1');Test5::test();Test6::test();function autoload1($class){    require __DIR__.'/'.$class.'.php';}

PSR-0 Specification:

• The namespace must be consistent with the absolute path
• The first letter of the class name must be capitalized.
• Except for the entry file, ". php" must have only one class.

Develop basic frameworks that comply with PSR-0 specifications

Spl standard library:

 

PHP chained operations:

<?phpnamespace 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);

Magic method:

• _ Get/_ set: takes over object attributes. When you assign a value to an inaccessible attribute, __set () is called. When you read the value of an inaccessible attribute, __get () is called.
• _ Call/_ callStatic: When an inaccessible method is called in an object, __call () is called. When an inaccessible method is called in a static method, __callstatic () will be called.
• _ ToString: converts a class to a string.
• _ Invoke: when an object is called by calling a function, the __invoke () method is automatically called.

Object. php

<?phpnamespace 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);    }    }

Index. php

$obj = new baobab\Object();$obj->title = 'hello';echo $obj->title;echo $obj->test1('hello', 123);echo $obj::test1('hello1', 1234);echo $obj;echo $obj('test1');

1. Three basic design modes

• Factory mode: use factory methods or class production objects, instead of directly creating new

Factory. php

<?phpnamespace Baobab;class Factory{    static function createDatabase(){        $db = new Database();        return $db;    }}

Index. php

$db = Baobab\Factory::createDatabase();
$db1 = Baobab\Factory::createDatabase();

$db->limit($limit);

• Singleton mode: allows only one class object to be created.

Database. php

<? Phpnamespace Baobab; class Database {protected static $ db; private function _ construct () {} static function getInstance () {if (self ::$ db) {return self :: $ db;} else {// self indicates the class itself, that is, self does not point to any instantiated object (: domain operator number) self :: $ db = new self (); return self: $ db ;}}

Index. php

$db = Baobab\Database::getInstance();

• Registration mode: implements global sharing and exchange of objects. You can register an object on the global tree and directly access it anywhere.

Register. php

<?phpnamespace Baobab;class Register{    protected static $objects;    static function set($alias, $object){        self::$objects[$alias] = $object;    }        static function _unset($alias) {        unset(self::$objects[$alias]);    }        static function get($name) {        return self::$objects[$name];    }}

// Register the database to the registration tree Register: set ('db1', $ db );

Index. php

$db = Baobab\Register::get('db1');