国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Table of Contents
A simple implementation method of php singleton mode, a simple implementation method of php example mode
Home Backend Development PHP Tutorial Simple implementation method of php singleton mode, php instance mode_PHP tutorial

Simple implementation method of php singleton mode, php instance mode_PHP tutorial

Jul 12, 2016 am 08:50 AM
php Singleton pattern

A simple implementation method of php singleton mode, a simple implementation method of php example mode

A simple implementation method of php singleton mode

<&#63;php 
 
/** 
* 設計模式之單例模式 
* $_instance必須聲明為靜態(tài)的私有變量 
* 構造函數(shù)和析構函數(shù)必須聲明為私有,防止外部程序new 
* 類從而失去單例模式的意義 
* getInstance()方法必須設置為公有的,必須調用此方法 
* 以返回實例的一個引用 
* ::操作符只能訪問靜態(tài)變量和靜態(tài)函數(shù) 
* new對象都會消耗內(nèi)存 
* 使用場景:最常用的地方是數(shù)據(jù)庫連接。 
* 使用單例模式生成一個對象后, 
* 該對象可以被其它眾多對象所使用。 
*/
class Example 
{ 
//保存例實例在此屬性中 
private static $_instance; 
 
//構造函數(shù)聲明為private,防止直接創(chuàng)建對象 
private function __construct() 
{ 
echo 'I am Construceted'; 
} 
 
//單例方法 
public static function singleton() 
{ 
if(!isset(self::$_instance)) 
{ 
$c=__CLASS__; 
self::$_instance=new $c; 
} 
return self::$_instance; 
} 
 
//阻止用戶復制對象實例 
public function __clone() 
{ 
trigger_error('Clone is not allow' ,E_USER_ERROR); 
} 
 
function test() 
{ 
echo("test"); 
 
} 
} 
 
// 這個寫法會出錯,因為構造方法被聲明為private 
$test = new Example; 
 
// 下面將得到Example類的單例對象 
$test = Example::singleton(); 
$test->test(); 
 
// 復制對象將導致一個E_USER_ERROR. 
$test_clone = clone $test; 
&#63;>

First of all, we need to understand the concept of singleton mode. So what is singleton mode?

The singleton mode, as its name suggests, means that there is only one instance.

As an object creation mode, the singleton mode ensures that a class has only one instance, instantiates itself and provides this instance to the entire system,

We call this class a singleton class.

There are three main points of the singleton pattern:

First, a class can only have one instance;

The second is that it must create this instance by itself;

Third, it must provide this instance to the entire system by itself.

Let’s discuss why we should use PHP singleton mode?

Most people understand its purpose from the literal meaning of the singleton pattern, thinking that it saves system resources, avoids repeated instantiation, and is a kind of "family planning". And PHP executes it every time All resources will be cleared from memory when the page is completed. Therefore, the singleton in PHP actually needs to be re-instantiated every time it is run, thus losing the meaning of repeated instantiation of the singleton. From this aspect alone It is said that PHP's singleton is indeed a bit disappointing to everyone. But does a singleton only have this function and application? The answer is no, let's take a look.

1. PHP is mainly used in database applications, so there will be a large number of database operations in an application. When developing in an object-oriented way (nonsense), if you use the singleton mode, you can avoid a lot of new operation consumption. resources.

2. If a class is needed to globally control certain configuration information in the system, it can be easily implemented using the singleton mode. This can be found in the FrontController part of zend Framework.

3. In a page request, it is easy to debug because all the code (such as database operation class db) is concentrated in one class. We can set hooks in the class and output logs to avoid var_dump and echo everywhere. .

The above simple implementation method of PHP singleton mode is all the content shared by the editor. I hope it can give you a reference, and I also hope that everyone will support Bangkejia.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1135012.htmlTechArticleA simple implementation method of php singleton mode, a simple implementation method of php singleton mode php /** * Singleton pattern of design pattern * $_instance must be declared as a static private variable * Construct...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

PHP Tutorial
1502
276
PHP calls AI intelligent voice assistant PHP voice interaction system construction 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 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 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 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 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 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 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 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.

See all articles