case for singletons with database access in PHP?

I access my MySQL database via PDO. I'm setting up access to the database, and my first attempt was to use the following: The first thing I thought of is global : $db = new PDO('mysql:host=127.0.0.1;dbname=toto', 'root', 'pwd'); function some_function() { global $db; $db->query('...'); } This is considered a bad practice. After a little search, I ended up with the Singleton

在PHP中使用数据库访问单例的情况?

我通过PDO访问我的MySQL数据库。 我设置了对数据库的访问权限,我的第一个尝试是使用以下内容: 我想到的第一件事是global : $db = new PDO('mysql:host=127.0.0.1;dbname=toto', 'root', 'pwd'); function some_function() { global $db; $db->query('...'); } 这被认为是不好的做法。 经过一番搜索,我结束了Singleton模式,其中 “适用于需要单个课程实例的情况。” 根据手册中的例子,我们应该这样做:

Creating the Singleton design pattern in PHP5

如何创建一个使用PHP5类的Singleton类? /** * Singleton class * */ final class UserFactory { /** * Call this method to get singleton * * @return UserFactory */ public static function Instance() { static $inst = null; if ($inst === null) { $inst = new UserFactory(); } return $inst; } /** * Private ctor so nob

在PHP5中创建Singleton设计模式

如何创建一个使用PHP5类的Singleton类? /** * Singleton class * */ final class UserFactory { /** * Call this method to get singleton * * @return UserFactory */ public static function Instance() { static $inst = null; if ($inst === null) { $inst = new UserFactory(); } return $inst; } /** * Private ctor so nob

Understanding IoC Containers and Dependency Injection

Quick Forward: I'm writing this with the intention of getting a better understanding of dependency injection and IoC containers, but also so that afterwards I can correct the mistakes in it and use it to help teach a few friends of mine about them as well. As of now I've tried reading through the documentation for various frameworks(laravel, fuel, codeigniter, symfony) and I found tha

了解IoC容器和依赖注入

快速前进: 我写这个的目的是为了更好地理解依赖注入和IoC容器,但是之后我可以纠正它中的错误,并用它来帮助我的几个朋友教导它们。 到目前为止,我已经尝试阅读各种框架(laravel,fuel,codeigniter,symfony)的文档,并且我发现框架有太多不同的方面,我需要使用它,我决定尝试使用它在尝试在框架中使用它们之前,先单独学习每个主要部分。 我花了数小时搜索各种各样的含义,查看了stackoverflow响应,并阅读了各种文

What is the point of interfaces in PHP?

Interfaces allow you to create code which defines the methods of classes that implement it. You cannot however add any code to those methods. Abstract classes allow you to do the same thing, along with adding code to the method. Now if you can achieve the same goal with abstract classes, why do we even need the concept of interfaces? I've been told that it has to do with OO theory from

PHP中的接口是什么?

接口允许您创建定义实现它的类的方法的代码。 但是,您不能将任何代码添加到这些方法。 抽象类允许您执行相同的操作,并为该方法添加代码。 现在,如果你可以用抽象类实现相同的目标,为什么我们甚至需要接口的概念? 我被告知它与OO理论有关,从C ++到Java,这是PHP的OO东西的基础。 该概念在Java中有用,但不在PHP中? 这只是一种避免在抽象类中散布占位符的方法吗? 我错过了什么吗? 接口的整个目的是让你灵活地

Dependency Injection prevent dependency on the dependency container

After puzzling around with the Dependency injection I'm worried about getting dependent on the DI container. So I thought I tie everything together with factories. But there seem to be an awful a lot of factories needed (One for every object(?)). Now what happens is the following: class houseFactory { protected $_di; public function __construct(DI $di) { $this->_s

依赖注入防止依赖容器的依赖

在依赖注入困惑之后,我担心依赖于DI容器。 所以我想我把所有东西都和工厂绑在一起。 但似乎需要很多工厂(每个对象(?)一个)。 现在会发生以下情况: class houseFactory { protected $_di; public function __construct(DI $di) { $this->_setDI($di) } protected function _setDI(DI $di) { $this->_di = $di; } public function createObject() {

PHPUnit assert that an exception was thrown?

有谁知道是否有assert或类似的东西可以测试是否在被测试的代码中抛出异常? <?php require_once 'PHPUnit/Framework.php'; class ExceptionTest extends PHPUnit_Framework_TestCase { public function testException() { $this->expectException(InvalidArgumentException::class); // or for PHPUnit < 5.2 // $this->setExpectedException(InvalidArgumentException::class);

PHPUnit断言抛出异常?

有谁知道是否有assert或类似的东西可以测试是否在被测试的代码中抛出异常? <?php require_once 'PHPUnit/Framework.php'; class ExceptionTest extends PHPUnit_Framework_TestCase { public function testException() { $this->expectException(InvalidArgumentException::class); // or for PHPUnit < 5.2 // $this->setExpectedException(InvalidArgumentException::class);

Php site deployment?

new to PHP depolyment. Have solid experience in .NET so deployment is as easy as right click & publish in Visual Studio. Currently, deployment in PHP means connecting to EC2 instance through Filezilla, dragging local folders into Filezilla and wait like forever for it to finish. Is this the standard way to deploy PHP sites or am I missing something here? What if I want to update my websit

Php站点部署?

PHP解析新手。 在.NET中有丰富的经验,因此部署就像在Visual Studio中右键单击并发布一样简单。 目前,在PHP中进行部署意味着通过Filezilla连接到EC2实例,将本地文件夹拖放到Filezilla中并等待永久完成。 这是部署PHP网站的标准方式,还是我在这里错过了一些东西? 如果我想更新我的网站内容怎么办? 重复一遍? 或上传修改后的文件? 但是如果我忘记了我被修改了哪些文件呢? Git的? 这是我首选的工作流程 启动本

Google map zoom level

I'm using a google map api from this website , thanks to the author. Here is part of the code: function initMap() { map = new google.maps.Map(document.getElementById("map"), { center: new google.maps.LatLng(0, 0), zoom: 14, mapTypeId: google.maps.MapTypeId.ROADMAP, mapTypeControl: false, mapTypeControlOptions: { style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR }, navigationC

Google地图缩放级别

感谢作者,我从本网站使用谷歌地图api。 这是代码的一部分: function initMap() { map = new google.maps.Map(document.getElementById("map"), { center: new google.maps.LatLng(0, 0), zoom: 14, mapTypeId: google.maps.MapTypeId.ROADMAP, mapTypeControl: false, mapTypeControlOptions: { style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR }, navigationControl: true, navigationControlOptions: {

Adding references in PHP to an array creates an array of references

Not sure if this is considered a bug $array = ['numbers' => [1, 2, 3]]; foreach ($array as &$numbers) { $numbers = [4, 5, 6]; } var_dump($array); modify_array($array); var_dump($array); function modify_array($array_arg) { $array_arg['numbers'] = [1, 2, 3]; } Prints array(1) { ["numbers"]=> &array(3) { [0]=> int(4) [1]=> int(5) [2]=> i

将PHP中的引用添加到数组中会创建一个引用数组

不知道这是否被认为是一个错误 $array = ['numbers' => [1, 2, 3]]; foreach ($array as &$numbers) { $numbers = [4, 5, 6]; } var_dump($array); modify_array($array); var_dump($array); function modify_array($array_arg) { $array_arg['numbers'] = [1, 2, 3]; } 打印 array(1) { ["numbers"]=> &array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) }

Custom autoescaper in Symfony 2

I need to add to Symfony 2 default autoescaper an ability to escape double curly brackets {{ and }}. So it should work without any modifications inside twig templates . I've tried to add custom escaper as $twig->getExtension('Twig_Extension_Core')->setEscaper('angular-html', $escaper); and replace default escaping strategy "html" with custom "angular-html" clas

在Symfony 2中自定义自动换算器

我需要添加到Symfony 2默认autoescaper中,以便能够转义双括号{{和}}。 所以它应该在没有任何修改的情况下工作。 我试图添加自定义的助手 $twig->getExtension('Twig_Extension_Core')->setEscaper('angular-html', $escaper); 并用自定义的“angular-html”替换默认的转义策略“html” class AngularEscapingStrategy { public static function guess($name) { $strategy = Twig_FileExtensionEscapingS