Course Intermediate  11277

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17603

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Advanced  11312

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

Course Introduction：Prerequisites Computer basics Basic programming concepts (such as variables, data types, and conditional statements) Install python and necessary libraries (such as pandas, NumPy, and Matplotlib) Step 1: Data import and exploration Use the Pandas library to read in CSV, excel, or database Data exploration of data structures, data types and statistics Find missing values, outliers and data distribution patterns Step 2: Data cleaning Process missing values ​​(e.g. fill with mean or median) Remove duplicates Transform data types (e.g. string Convert to numbers) Normalize the data (e.g. convert different measurement units to the same unit) Step 3: Data Analysis Descriptive Statistics: Calculate statistics such as mean, median, standard deviation, etc.

2024-03-17 comment 0  1195

Course Introduction：PHPPDF to Binary Conversion In web applications, the generation and processing of PDF files are often used, and PHPPDF is a popular PHP library that can be used to generate PDF files. When working with PDF files, the need to convert them to binary format is also common. This article will introduce how to use the PHPPDF library to convert PDF files to binary format. Introduction to PHPPDF library PHPPDF is a pure PHP library used to generate, modify and process PDF files. It can generate pages, images, tables, forms and various

2023-04-03 comment 0  1263

Course Introduction：With the generation and transmission of large amounts of data in various industries, files in CSV format have great advantages in data storage and processing. However, CSV file is not a user-friendly format as it is just a simple text file format and does not provide the functionality of complex operations such as running functions. Therefore, converting CSV files to Excel format files will be more convenient for data use. In PHP, we can use the PHPExcel library to convert CSV files to Excel format files. PHPExcel is a tool specifically designed for PHP development

2023-05-28 comment 0  665

Course Introduction：Form submission: Form submission PHP form submission form name containing a dot () will be converted into an underscore (_): Recently, when I was working on a company project, I discovered a strange problem. When I submitted a normal form, I found that it could not be obtained normally. Submitted value, this discovery made me confused at first. At first, I thought there was a problem with my service and could not write to the database normally. Later, after detecting the SQL statement, I found that the problem actually appeared in the acquisition. In terms of data, the obtained data was all empty. Later, after debugging, it was discovered that all the variables originally submitted to the backend were no longer the expected variables, but had been converted by PHP. The test code is provided as follows: Copy the code The code is as follows:&

2016-07-29 comment 0  902

Course Introduction：PHP timestamps measure the number of seconds from January 1, 1970 00:00:00 UTC to the current time. It is used to record and calculate date and time in PHP. In PHP, a timestamp is an integer representing the number of seconds since the Unix epoch, January 1, 1970 00:00:00 UTC. Therefore, it can be used to convert and compare times. PHP timestamps are 10 or 13 digits, depending on the functions and operations used. In this article, we will look at the two representations of timestamps in PHP and how to use them in code

2023-03-29 comment 0  573