依赖注入在PHP [英] Dependency Injection in PHP

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本文介绍了依赖注入在PHP的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我一直在寻找到依赖注入。

  • 我是上的东西或者是完全关闭？
  • 是code好坏 - 依赖注入与否
    • ？

下面code是一个CMS系统

基础

现在有一个叫做page_details与所有存储在其中的网页表格。

目录/文件结构 

 的.htaccess
的index.php
类/ Db.class.php
类/ Page.class.php
配置/ config.php文件
配置/的init.php

的.htaccess 

 ＃mod-rewrite启用。
选项​​+的FollowSymLinks
RewriteEngine叙述上

＃----规则----

重写规则^（[A-ZA-Z0-9 -_] +）\。HTML $的index.php？网页= $ 1 [NC，L]

的index.php 

 ＆LT; PHP的require_once（'配置/的init.php'）; ？＆GT;
！＆LT; D​​OCTYPE HTML PUBLIC -  // W3C // DTD XHTML 1.0过渡// ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
＆LT; HTML的xmlns =htt​​p://www.w3.org/1999/xhtmlXML：LANG =ENLANG =EN＆GT;
＆LT; HEAD＆GT;
    ＆LT; META HTTP-当量=内容类型内容=text / html的;字符集= ISO-8859-1/＆GT;
    ＆LT; META HTTP-当量=imagetoolbarCONTENT =NO/＆GT;
    ＆LT;冠军＆GT;＆LT; /标题＆GT;
    ＆LT; META NAME =说明内容=/＆GT;
    ＆LT; META NAME =关键词内容=/＆GT;
    ＆LT;链接HREF =/ CSS / Styles.css中媒体=屏幕相对=样式类型=文本/ CSS/＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
＆LT; PHP
$页=新的页面（$分贝）;
的print_r（$页级＆GT; get_page（$ _ GET ['页']））;
？＆GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;

Db.class.php 

 ＆LT; PHP
一流的分贝
{
    私人$ DBHOST;
    私人$ DBUSER;
    私人$ DBPASSWORD;
    私人$ DBNAME;
    私人$连接;
    公众$查询;
    功能__construct（$ DBHOST，$ DBUSER，$ DBPASSWORD，$ DBNAME）
    {
        $这个 - ＆GT; DBHOST = $ DBHOST;
        $这个 - ＆GT; DBUSER = $ DBUSER;
        $这个 - ＆GT; DBPASSWORD = $ DBPASSWORD;
        $这个 - ＆GT;数据库名= $ DBNAME;
    }
    公共职能OPEN_CONNECTION（）
    {
        尝试
        {
            $这个 - ＆GT;连接= mysqli_connect（$这个 - ＆GT; DBHOST，$这个 - ＆GT; DBUSER，$这个 - ＆GT;
                DBPASSWORD，$这个 - ＆GT; DBNAME）;
        }
        赶上（异常$ E）
        {
            抛出$ê;
        }
    }
    公共职能密切（$查询）
    {
        尝试
        {
            mysqli_close（$这个 - ＆GT;连接）;
        }
        赶上（异常$ E）
        {
            抛出$ê;
        }
    }
    公共功能查询（$查询）
    {
        尝试
        {
            $这个 - ＆GT; OPEN_CONNECTION（）;
            $结果= mysqli_query（$这个 - ＆GT;连接，$查询）;
            返回$结果;
        }
        赶上（异常$ E）
        {
            抛出$ê;
        }
        $这个 - ＆GT; close_connection（）;
    }
    公共职能fetchArray（$查询）
    {
        $行= mysqli_fetch_assoc（$查询）;
        返回$行;
    }
    公共职能COUNT_ROWS（$查询）
    {
        $行= mysqli_num_rows（$查询）;
        返回$行;
    }
    公共职能rows_affected（）
    {
        $行= mysqli_affected_rows（$这个 - ＆GT;连接）;
        返回$行;
    }
    公共职能created_id（）
    {
        $行= mysqli_insert_id（$这个 - ＆GT;连接）;
        返回$行;
    }
}
？＆GT;

Page.class.php 

 ＆LT; PHP
类网页
{
    私人$分贝;
    功能__construct（$分贝）
    {
        $这个 - ＆GT; DB = $分贝;
    }
    功能get_page（$ seo_url）
    {
        $ SQL = $这个 - ＆GT; DB-＆GT;查询（SELECT * FROM page_details WHERE seo_url ='$ seo_url'）;
        $行= $这个 - ＆GT; DB-＆GT; fetchArray（$ SQL）;
        返回$行;
    }
}
？＆GT;

的config.php 

 ＆LT; PHP
$配置=阵列（）;
$配置['DBTYPE'] ='的mysqli';
$配置['DBHOST'] ='localhost'的;
$配置['DBNAME'] ='名';
$配置['DBUSER'] ='用户';
$配置['DBPASSWORD'] ='密码';
$配置['absolute_path'] ='/var/www/vhosts/example.com/httpdocs';
$配置['website_root'] ='http://www.example.com/';
$配置['假'] ='';
？＆GT;

的init.php 

 ＆LT; PHP
require_once（配置/ config.php文件）;
函数__autoload（$将class_name）
{
    require_once（''。$配置['absolute_path'。班/ .class.php'$将class_name。'）;
}
$ DB =新的数据库（$配置['DBHOST']，$配置['DBUSER']，$配置['DBPASSWORD']，$配置['DBNAME']）;
？＆GT;

解决方案

我不知道你怎么想到要获得 __自动加载来叫（我不明白你叫新SomeClass的在code的任何地方），但它的使用 __自动加载自动包括面部应加载的类是一个好主意的，而你使用它的权利。

虽然你的code一些一般性意见：

  1. 我会用PDO来代替的mysqli直接 - 它有点更安全（SQL注入明智的），更面向未来，我认为它也很容易
    2. 。
  2. 我会检查要求 D文件试图要求它之前存在，并抛出一个漂亮的异常可以被捕获的应用程序，并报告在一个不错的方式。
  3. 您可能希望打印您的内容，而不是的print_r ，但我猜你做调试。

I have been looking into Dependency Injection.

  • Am I on to something or is it completely off?
  • Is the code good or bad - Dependency Injection or not?

The below code is the foundation for a CMS system

Right now there is a table called "page_details" with all the web pages stored in it.

Directory/file structure

.htaccess
index.php
classes/Db.class.php
classes/Page.class.php
config/config.php
config/init.php

.htaccess

# Mod rewrite enabled.
Options +FollowSymLinks
RewriteEngine on

# ---- Rules ----

RewriteRule ^([A-Za-z0-9-_]+)\.html$ index.php?page=$1 [NC,L]

index.php

<?php require_once ('config/init.php'); ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <meta http-equiv="Content-type" content="text/html; charset=iso-8859-1" />
    <meta http-equiv="imagetoolbar" content="no" />
    <title></title>
    <meta name="Description" content="" />
    <meta name="Keywords" content="" />
    <link href="/css/styles.css" media="screen" rel="Stylesheet" type="text/css" />
</head>
<body>
<?php
$page = new Pages($db);
print_r($page->get_page($_GET['page']));
?>
</body>
</html>

Db.class.php

<?php
class Db
{
    private $dbhost;
    private $dbuser;
    private $dbpassword;
    private $dbname;
    private $connection;
    public $query;
    function __construct($dbhost, $dbuser, $dbpassword, $dbname)
    {
        $this->dbhost = $dbhost;
        $this->dbuser = $dbuser;
        $this->dbpassword = $dbpassword;
        $this->dbname = $dbname;
    }
    public function open_connection()
    {
        try
        {
            $this->connection = mysqli_connect($this->dbhost, $this->dbuser, $this->
                dbpassword, $this->dbname);
        }
        catch (exception $e)
        {
            throw $e;
        }
    }
    public function close($query)
    {
        try
        {
            mysqli_close($this->connection);
        }
        catch (exception $e)
        {
            throw $e;
        }
    }
    public function query($query)
    {
        try
        {
            $this->open_connection();
            $result = mysqli_query($this->connection, $query);
            return $result;
        }
        catch (exception $e)
        {
            throw $e;
        }
        $this->close_connection();
    }
    public function fetchArray($query)
    {
        $row = mysqli_fetch_assoc($query);
        return $row;
    }
    public function count_rows($query)
    {
        $row = mysqli_num_rows($query);
        return $row;
    }
    public function rows_affected()
    {
        $row = mysqli_affected_rows($this->connection);
        return $row;
    }
    public function created_id()
    {
        $row = mysqli_insert_id($this->connection);
        return $row;
    }
}
?>

Page.class.php

<?php
class Pages
{
    private $db;
    function __construct($db)
    {
        $this->db = $db;
    }
    function get_page($seo_url)
    {
        $sql = $this->db->query("SELECT * FROM page_details WHERE seo_url='$seo_url'");
        $row = $this->db->fetchArray($sql);
        return $row;
    }
}
?>

config.php

<?php
$config = array();
$config['dbtype'] = 'mysqli';
$config['dbhost'] = 'localhost';
$config['dbname'] = 'name';
$config['dbuser'] = 'user';
$config['dbpassword'] = 'password';
$config['absolute_path'] = '/var/www/vhosts/example.com/httpdocs';
$config['website_root'] = 'http://www.example.com/';
$config['dummy'] = '';
?>

init.php

<?php
require_once ('config/config.php');
function __autoload($class_name)
{
    require_once (''.$config['absolute_path'].'classes/' . $class_name . '.class.php');
}
$db = new Db($config['dbhost'], $config['dbuser'], $config['dbpassword'], $config['dbname']);
?>

解决方案

I'm not sure how you expect to get __autoload to be called (I don't see you calling new someclass anywhere in your code), but on the face of it using __autoload to automatically include classes that should be loaded is a good idea, and you're using it right.

Some general comments on your code though:

  1. I would have used PDO instead of mysqli directly - it somewhat safer (SQL injection wise), more future proof, and I think its also easier.
  2. I would check that the required file exists before attempting to require it, and throw a nice exception that can be caught by the application and reported in a nice way.
  3. you probably want to print your content and not print_r it, but I guess you do that for debugging.

这篇关于依赖注入在PHP的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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