Article Introduction：Introduction to concurrency and multi-thread processing skills of PHP crawlers: With the rapid development of the Internet, a large amount of data information is stored on various websites, and obtaining this data has become a requirement in many business scenarios. As a tool for automatically obtaining network information, crawlers are widely used in data collection, search engines, public opinion analysis and other fields. This article will introduce a concurrency and multi-threading processing technique for a PHP-based crawler class, and illustrate its implementation through code examples. 1. The basic structure of the reptile class is used to realize the concurrency and multi-threading of the reptile class.

2023-08-08 comment 0  1238

Article Introduction：Thinking about thread safety issues of singleton mode in PHP In PHP programming, singleton mode is a commonly used design pattern. It can ensure that a class has only one instance and provide a global access point to access this instance. However, when using the singleton pattern in a multi-threaded environment, thread safety issues need to be considered. The most basic implementation of the singleton pattern includes a private constructor, a private static variable, and a public static method. The specific code is as follows: classSingleton{pr

2023-10-15 comment 0  572

Article Introduction：In machine learning, linear regression is a common supervised learning algorithm used to make predictions by establishing a linear relationship between one or more independent variables and a continuous dependent variable. Similar to linear regression in traditional statistics, linear regression in machine learning also determines the best-fit line by minimizing the loss function. Through this algorithm, we can use known data sets to build a linear model, and then use this model to predict new data. This algorithm is widely used in predicting continuous variable problems such as housing prices and sales. Linear regression is implemented in two ways in machine learning: batch gradient descent and normal equations. Batch gradient descent is an iterative method that minimizes the loss function by adjusting model parameters. Normal equations are an analytical method that solves

2024-01-23 comment 0  1038

Article Introduction：You can significantly improve the performance of your PHP framework applications by implementing the following optimization techniques: Use an object cache, such as Redis or Memcached, to store heavy query results or function calls. Enable page caching, such as Varnish or Nginx, to cache all or part of a web page. Optimize database queries, using appropriate indexes and batching requests. Reduce unnecessary requests, such as merging CSS and JS files, using lazy loading techniques, and compressing images. Optimize code, use appropriate data types, avoid unnecessary loops and variable copies, and use code analysis tools to identify performance bottlenecks.

2024-04-30 comment 0  1070

Article Introduction：Among computer operating systems, WIN7 system is a very classic computer operating system, so how to install win7 system? The editor below will introduce in detail how to install the win7 system on your computer. 1. First download the Xiaoyu system and reinstall the system software on your desktop computer. 2. Select the win7 system and click "Install this system". 3. Then start downloading the image of the win7 system. 4. After downloading, deploy the environment, and then click Restart Now after completion. 5. After restarting the computer, the Windows Manager page will appear. We choose the second one. 6. Return to the computer pe interface to continue the installation. 7. After completion, restart the computer. 8. Finally come to the desktop and the system installation is completed. One-click installation of win7 system

2023-07-16 comment 0  1205

Article Introduction：:This article mainly introduces php-insertion sort. Students who are interested in PHP tutorials can refer to it.

2016-08-08 comment 0  1060

Article Introduction：charles captures requests in eclipse

2016-12-02 comment 0  1692

Article Introduction：Illustrated method to find the path of the PHP configuration file php.ini. Graphical method to find the path of the PHP configuration file php.ini. Recently, some bloggers asked in which directory php.ini exists? Or why does it not take effect after modifying php.ini? Based on the above two questions,

2016-07-13 comment 0  809

Article Introduction：IT House reported on July 14 that Huawei recently released new commercial AI storage products "OceanStorA310 deep learning data lake storage" and "FusionCubeA3000 training/pushing hyper-converged all-in-one machine". Officials said that "these two products can train basic AI models." , industry model training, and segmented scenario model training and inference provide new momentum." ▲ Picture source Huawei IT Home compiled and summarized: OceanStorA310 deep learning data lake storage is mainly oriented to basic/industry large model data lake scenarios to achieve data regression from Massive data management in the entire AI process from collection and preprocessing to model training and inference application. Officially stated that OceanStorA310 single frame 5U supports the industry’s highest 400GB/s

2023-07-16 comment 0  1539

Article Introduction：The difference between the exec function and the shell_exec function in PHP, execshell_exec. The difference between the exec function and the shell_exec function in PHP. Both execshell_exec functions execute Linux command functions. The difference is that the return results are different. exec can only get the last line number.

2016-07-13 comment 0  1058

Article Introduction：Nginx server combines Nginx and tomcat to access jsp

2016-12-02 comment 0  1809

Article Introduction：:This article mainly introduces the PHP function container ing..., students who are interested in PHP tutorials can refer to it.

2016-08-08 comment 0  1099

Article Introduction：Interface usage of PHP object-oriented programming, PHP object-oriented programming. Interface usage in PHP object-oriented programming, PHP object-oriented programming interface is a very important concept in PHP object-oriented programming. This article explains in more detail in the form of examples

2016-07-13 comment 0  983

Article Introduction：PHP object-oriented programming and other constant usage examples, sed usage examples. Examples of constant usage in PHP object-oriented programming, examples of sed usage. Class constants are a very important concept in PHP object-oriented programming. A firm grasp of class constants will help further improve

2016-07-13 comment 0  1019

Article Introduction：Java Tutorial—The Difference Between Int and Integer

2016-12-02 comment 0  1990

Article Introduction：Here is a JAVASCRIPT client solution for obtaining URLs with QUESTRING parameters, which is equivalent to ASP's request.querystring and PHP's $_GET

2017-04-24 comment 0  4135

Article Introduction：JavaWeb learning summary_Servlet development

2016-12-02 comment 0  1941

Article Introduction：Examples explain PHP object-oriented polymorphism, examples explain object-oriented. Examples explain object-oriented polymorphism in PHP. Examples explain object-oriented polymorphism. What is polymorphism? Polymorphism is the third feature of object-oriented languages ​​after database abstraction and inheritance. Polymorphism is many

2016-07-13 comment 0  907

Article Introduction：This article mainly introduces the document structure of HTML5 and the complete analysis of new tags. Friends in need can refer to it.

2017-04-24 comment 0  2384

Article Introduction：Learn the YII2 framework from scratch (5) Use of the rapid code generation tool Gii, yii2gii. Learn the YII2 framework from scratch (5) Use of the rapid code generation tool Gii, yii2gii The reason why the Yii2 framework is called a framework for efficient and rapid development is because there is a magical tool

2016-07-13 comment 0  1436