PHP异步操作
废话不说直接进入正题:
应用场景:
业务逻辑中经常会出现发送信息,发送邮件,记录日志等等,这个时候用异步再好不过了,用户直接的体验就是:使用的贼流畅~~
使用技术:
1.gearman : 这个不仅仅支持PHP了其他语言也支持
2.swoole : 有PHP的扩展,用起来更方便
NOTE:感觉上 gearman = swoole + 异步队列;
不同点:
1.gearman有个队列专门用来存储发送过来的异步请求,即使worker挂了,重启以后,照样也能将没有处理的请求处理.swoole在这点上没有专门的处理
2.swoole的使用安装更为方便,使用C语言写的PHP扩展,性能测试了下,杠杠的,使用到目前为止没有什么问题,gearman的安装比较麻烦,网上文章一大堆,试了很多都没用,后来到了gearman的官网才解决掉.
3.gearman的历史比较悠久,使用场景很丰富,有详细的文档,业务量不算很大的使用,非常稳定.swoole是中国人开发的(支持国产),有很多大型公司在使用,
详细的gearman安装文档:
yum -y install libgearmanyum install libgearman-develwget http://pecl.php.net/get/gearman-1.1.2.tgztar -zxvf gearman-1.1.2.tgzcd gearman-1.1.2/data/apps/php/bin/phpize./configure --prefix=/data/apps/phpgearman --with-php-config=/data/apps/php/bin/php-configmake&& make installvim /data/apps/php/etc/php.ini增加extension=gearman.so测试vim worker.php <?php$worker= new GearmanWorker();$worker->addServer();$worker->addFunction("reverse", "my_reverse_function");while ($worker->work());function my_reverse_function($job){ return strrev($job->workload());}?>vim client.php<?php$client= new GearmanClient();$client->addServer();print $client->do("reverse", "Hello World!");?>php client.php!dlroW olleH
安装swoole的PHP扩展:
wget http://pecl.php.net/get/swoole-1.7.17.tgztar -zxvf swoole-1.7.17.tgzcd swoole-1.7.17phpize./configuremake && make install

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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