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- Dynamically generate form fields based on user input
- This article aims to describe how to use PHP to dynamically generate form fields based on user inputs in previous fields. With a simple example, it demonstrates how to create a corresponding number of text input boxes based on the number of fields specified by the user. At the same time, the importance of data verification in practical applications is also emphasized to ensure the robustness and security of the program.
- PHP Tutorial . Backend Development 656 2025-08-26 16:54:01
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- A practical guide to converting strings to integers in relational objects
- This document is intended to guide developers how to convert a number of string types that contain currency symbols and commas into integers in a Laravel Eloquent relation object. By defining type conversion in the model, it is easy to process string data obtained from the database, ensuring consistency of data types, and simplifying subsequent calculation and processing flow. This article will provide detailed steps and sample code to help you easily implement string to integer conversion.
- PHP Tutorial . Backend Development 481 2025-08-26 16:51:01
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- Tutorial on using BINARY for case-sensitive queries in Doctrine ORM
- This tutorial will guide you how to implement case-sensitive string queries in Doctrine Query Builder and DQL, especially with the BINARY operator. Since BINARY is not a DQL function natively supported by Doctrine, we need to extend the functionality of Doctrine by integrating the beberlei/DoctrineExtensions library and configuring custom DQL user functions to achieve precise data filtering in the application.
- PHP Tutorial . Backend Development 715 2025-08-26 16:12:00
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- Tutorial to solve the problem of session ID loss in asynchronous callbacks
- This tutorial aims to solve the problem that PHP session ID (Session ID) cannot be consistent on the callback page in an asynchronous API callback scenario. We will analyze the root cause of the problem in detail and provide a solution based on passing unique transaction identifiers to ensure that user requests and API responses can be correctly associated with inter-server callbacks, thereby enabling user-side status updates, with code examples and precautions.
- PHP Tutorial . Backend Development 544 2025-08-26 16:06:00
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- JSON data analysis: type conversion and correct value acquisition
- This article aims to solve the type conversion problem encountered in JSON data parsing. When using functions such as json_encode() to encode data into a JSON string, numerical and boolean values ??may be converted to strings. This article will explain how to convert the value of the string type back to its original type after parsing JSON data, ensuring the correct data type is obtained in the application. With the example code, we will show how to type convert a single value using the JSON.parse() method and provide ideas for dealing with nested objects.
- PHP Tutorial . Backend Development 879 2025-08-26 16:00:01
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- PHP floating point number accuracy trap: In-depth analysis of var_dump and numerical comparison
- This article explores in-depth common pitfalls of floating point comparison in PHP, especially when var_dump is displayed as an integer value (such as -1), the actual comparison may lead to unexpected results (such as -1 less than -1). The article explains the storage principle of floating-point numbers in computers, accuracy issues, and display limitations of var_dump, and provides best practices to avoid these issues, including comparisons using floating-point number tolerances (Epsilon) and how to robustly handle boundary values ??in specific scenarios such as trigonometric input checks.
- PHP Tutorial . Backend Development 307 2025-08-26 15:51:02
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- PHP array sorting alphabetical tutorial
- This tutorial is intended to explain how to use PHP to sort array data obtained from a database alphabetically and convert it to JSON format. We will focus on using the ORDER BY clause for sorting in SQL queries, which is a more efficient way to do it instead of sorting in PHP. Through this article, you will learn how to sort data at the database level to optimize your PHP application performance.
- PHP Tutorial . Backend Development 207 2025-08-26 15:45:01
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- Magento 2 Order Programmatic Cancellation Tutorial: Handle Order Status Updates After Some Products Cancelled
- This tutorial provides detailed instructions on how to cancel an order programmatically in Magento 2, especially when a customer cancels some items in the order in batches, which ultimately leads to all items being cancelled, and how to automatically update the order status to "Cancelled". The article will provide complete code examples and explain key logic and best practices to ensure the accuracy and efficiency of order status management.
- PHP Tutorial . Backend Development 189 2025-08-26 15:42:01
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- Master Laravel authentication: Solve the common problem of Auth::user() as null
- This article discusses in-depth the common reasons and solutions for Auth::user() to return null in Laravel applications. This problem is often encountered when developers manually manage user sessions (such as session('person_id')) rather than taking full advantage of Laravel's built-in authentication mechanism. The tutorial will provide detailed instructions on how to correctly configure the user model, call Auth::login() or rely on Auth::attempt() in the registration and login process, so as to ensure that the user identity is globally accessible, avoid unnecessary database queries, and improve application security and development efficiency.
- PHP Tutorial . Backend Development 188 2025-08-26 15:27:01
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- Best practices for dynamic SQL query and parameterized execution
- This tutorial explores how to efficiently and securely execute duplicate SQL queries containing dynamic parameters such as date ranges in PHP. The article will analyze common problems and recommends the use of structured data, PDO preprocessing statements and parameter binding to build flexible and maintainable database operation functions, thereby avoiding the risks of global variables and SQL injection and improving code quality.
- PHP Tutorial . Backend Development 223 2025-08-26 15:24:00
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- Scheme for safely redirecting users to different domain names and keeping logged in
- This article explores how to safely redirect users from the primary domain name (PrimaryDomain.com) to the subdomain (SecondaryDomain.com) and stay logged in in SaaS products. The article analyzes single sign-on (SSO) schemes, especially the SAML protocol, and explains how to leverage Identity Providers (IdP) and Service Providers (SP) to achieve cross-domain authentication, ensuring users seamlessly switch between different domain names and maintain secure login.
- PHP Tutorial . Backend Development 495 2025-08-26 15:21:01
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- PHP file read and write operations: read, process and write grade data
- This document details how to use PHP for file reading and writing operations, and demonstrates in a practical case how to read grades from grades.txt file, add 1 (maximum value is 5), then write processed grades to the results.txt file, and finally output these processed grades in the console. Through this article, you will master the basic methods of PHP file operation and learn how to process data in files.
- PHP Tutorial . Backend Development 888 2025-08-26 15:15:01
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- Implement email authenticity verification in Laravel: Use Trumail API to ensure email accessibility
- This article explores methods to verify the authenticity of mailboxes (i.e., mailbox accessibility) in Laravel applications, which goes beyond traditional formats and domain name verification. We will introduce how to use third-party APIs such as Trumail for in-depth verification, and use Laravel's HTTP client and custom verification rules to effectively judge the accessibility of the mailbox, ensuring that the user provides a real and active mailbox address.
- PHP Tutorial . Backend Development 378 2025-08-26 15:06:01
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- Solve the problem of frequent changes in the Session ID of the callback URL page
- This article provides a solution to the problem of frequent changes in the Session ID in the API callback URL page: by setting cookies to replace the Session, so as to keep the ID stable in the callback URL. The article explains the reasons for the problem in detail and gives a specific implementation method of using cookies to help developers solve similar callback data association problems.
- PHP Tutorial . Backend Development 878 2025-08-26 15:00:08
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