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Quick Tip: How to Trim Whitespace with PHP

This article will discuss several methods and application scenarios for removing the beginning and end spaces of strings in PHP. Spaces in a string usually refer to spaces at the beginning or end. (The spaces between words are also spaces, but this article mainly focuses on the beginning and end spaces.) In PHP string processing, the beginning and the end spaces often cause trouble. Removing spaces can effectively clean and standardize data. The importance of removing spaces Give an example of the importance of removing spaces: Suppose that a user name is stored in the database, and a user accidentally adds a space at the end of the user name. This can cause problems with search or sorting. Use the trim() function to remove the beginning and end spaces to ensure that all usernames in the database are consistent in format and are easier to handle. Remove empty space when processing text-based data formats such as XML or JSON

Feb 08, 2025 am 11:34 AM

PHP Authorization with JWT (JSON Web Tokens)

Application authentication used to rely solely on credentials such as username/mailbox and password, and the session was used to maintain user status until the user logged out. After that, we started using the authentication API. Recently, JSON Web Tokens (JWT) are increasingly used to authenticate server requests. This article will introduce what JWT is and how to use PHP for JWT-based user request authentication. Important points Evolution of authentication methods: This article outlines the evolution of user authentication methods, from traditional sessions to using JSON Web Tokens (JWT), highlighting the transition to a more secure and efficient way of user authentication and session management for web applications. . JWT's Excellence

Feb 08, 2025 am 09:57 AM

Quick Tip: How to Filter Data with PHP

Key Points Never trust external input in the application. It is crucial to filter any data contained in your application to prevent attackers from injecting code. The two main types of data filtering in PHP are verification and cleaning. Verification ensures that external inputs meet expectations, while cleaning removes illegal or unsafe characters from external inputs. PHP provides a range of filters for verification and cleaning. These filters can be applied using the filter_var() and filter_input() functions to make your PHP applications safer and more reliable. This article will explore why anything contained in a filter application is so important. In particular, we will look at how to verify and clean external data in PHP

Feb 08, 2025 am 09:14 AM

How to Use the REGEX Functions in Excel

Quick review of Excel regular expression functions: REGEXTEST, REGEXEXTRACT and REGEXREPLACE Regular expressions (REGEX) are search patterns used to check if a text string complies with a given pattern and to extract or replace a text string matching the given pattern. Given its complexity, this article provides a simplified summary and example of its use in Excel. The REGEX function is suitable for users using Microsoft 365 Excel for Windows or Mac, as well as those using web versions of Excel. REGEXTEST: Text pattern matching test This function tests whether the text string is in the same way as

Feb 06, 2025 pm 10:28 PM