Up to now, we have talked about some basic concepts. The examples in the first two articles are very helpful for us to understand the implementation of dependency injection. Now we will go deep into the implementation of Symfony 2 service container.
The dependency injection container in Symfony is managed by a class called sfServiceContainer
The Symfony container can exist as an independent component. Symfony's official Subversion repository can be downloaded: http://svn .symfony-project.com/components/dependency_injection/trunk/
. It is worth noting that this component is still under continuous iterative development, so it may be updated at any time (it was said in 2009, but it seems to have stopped now).
According to Symfony’s design philosophy, any service can be an object managed by a container. In the Zend_Mail example introduced in the previous article, there are two objects: mailer and mail_transport
class Container
{
static protected $shared = array();
protected $parameters = array();
public function __construct(array $parameters = array())
{
$this->parameters = $parameters;
}
public function getMailTransport()
{
return new Zend_Mail_Transport_Smtp('smtp.gmail.com', array(
'auth' => 'login',
'username' => $this->parameters['mailer.username'],
'password' => $this->parameters['mailer.password'],
'ssl' => 'ssl',
'port' => 465,
));
}
public function getMailer()
{
if (isset(self::$shared['mailer']))
{
return self::$shared['mailer'];
}
$class = $this->parameters['mailer.class'];
$mailer = new $class();
$mailer->setDefaultTransport($this->getMailTransport());
return self::$shared['mailer'] = $mailer;
}
}If the Container class inherits Symfony's sfServiceContainer class, the code can be made a little simpler
class Container extends sfServiceContainer
{
static protected $shared = array();
protected function getMailTransportService()
{
return new Zend_Mail_Transport_Smtp('smtp.gmail.com', array(
'auth' => 'login',
'username' => $this['mailer.username'],
'password' => $this['mailer.password'],
'ssl' => 'ssl',
'port' => 465,
));
}
protected function getMailerService()
{
if (isset(self::$shared['mailer']))
{
return self::$shared['mailer'];
}
$class = $this['mailer.class'];
$mailer = new $class();
$mailer->setDefaultTransport($this->getMailTransportService());
return self::$shared['mailer'] = $mailer;
}
}By observation: The constructor and parameter configuration management code are omitted.
But that’s not all. sfServiceContainer can give us a powerful and concise interface. The following are some points to pay attention to when using the interface:
1. The name of the method to obtain the service must be suffixed with Service. Usually we agree that the name of the method starts with get and ends with Service. Each service has a unique logo. The logo is usually the method name without the prefix and suffix, separated by underscores. If the getMailTransportService() method is defined, the service name is mail_transport
2. The method is of protected type, which means you cannot directly call the method to obtain the service. We will introduce how to use containers to obtain services later.
3. The container can be accessed as an array to obtain the passed parameters. For example: $this[‘mailer.class’]
The service mark must be unique and can only consist of letters, numbers, ‘_’ and ‘.’. '.' can be used as a namespace (such as mail.mailer and mail.transport).
Now let’s see how to use this new container
require_once 'PATH/TO/sf/lib/sfServiceContainerAutoloader.php'; sfServiceContainerAutoloader::register(); $sc = new Container(array( 'mailer.username' => 'foo', 'mailer.password' => 'bar', 'mailer.class' => 'Zend_Mail', )); $mailer = $sc->mailer;
Because the Container class inherits sfServiceContainer, the interface becomes very neat.
The service is accessed through the unified interface
if ($sc->hasService('mailer'))
{
$mailer = $sc->getService('mailer');
}
$sc->setService('mailer', $mailer);A simpler way is that the service is accessed through attributes
if (isset($sc->mailer))
{
$mailer = $sc->mailer;
}
$sc->mailer = $mailer;The parameters are accessed through the unified interfaceif (!$sc->hasParameter('mailer_class'))
{
$sc->setParameter('mailer_class', 'Zend_Mail');
}
echo $sc->getParameter('mailer_class');
// Override all parameters of the container
$sc->setParameters($parameters);
// Adds parameters
$sc->addParameters($parameters);Parameters can also be accessed through the container like an array
if (!isset($sc['mailer.class']))
{
$sc['mailer.class'] = 'Zend_Mail';
}
$mailerClass = $sc['mailer.class'];The container can be viewed as an iterator, traversing all services
foreach ($sc as $id => $service)
{
echo sprintf("Service %s is an instance of %s.\n", $id, get_class($service));
}If there are not many services that need to be managed, although you still have to do a lot of basic work and copy a lot of code, you have to admit that using sfServiceContainer is very useful.
If the number of services to be managed becomes more and more, there must be a better way to describe the services.
This is why most of the time, we do not use the sfServiceContainer class directly. Even so, it is necessary to spend some time talking about it, because it is an important cornerstone of Symfony's dependency injection container.
The above is the content of understanding PHP dependency injection container series (3) Symfony. For more related content, please pay attention to the PHP Chinese website (www.miracleart.cn)!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
PHP calls AI intelligent voice assistant PHP voice interaction system construction
Jul 25, 2025 pm 08:45 PM
User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.
How to use PHP to build social sharing functions PHP sharing interface integration practice
Jul 25, 2025 pm 08:51 PM
The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.
How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization
Jul 25, 2025 pm 08:57 PM
To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X
PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy
Jul 25, 2025 pm 08:27 PM
1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.
How to use PHP to combine AI to generate image. PHP automatically generates art works
Jul 25, 2025 pm 07:21 PM
PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.
PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism
Jul 25, 2025 pm 08:30 PM
PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.
Beyond the LAMP Stack: PHP's Role in Modern Enterprise Architecture
Jul 27, 2025 am 04:31 AM
PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway
PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution
Jul 25, 2025 pm 07:06 PM
Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.
