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Article Introduction：PHP implements filtering of various HTML tags. PHP implements filtering of various HTML tags. In the process of working on projects, we often need to filter some HTML tags to improve data security. In fact, it is to delete those that are harmful to the application.

2016-07-13 comment 0  1303

Article Introduction：This article demonstrates building a PHP application that interacts with the YouTube Data API v3, adding search and category filtering capabilities to a previous "most popular videos" application. Key Features and Improvements: Video Cate

2025-02-17 comment 0  699

Article Introduction：PHP provides a variety of methods to filter array elements. The preferred array_filter implements flexible filtering. It defines filtering conditions through a callback function, such as retaining elements greater than 10; if no callback is provided, the item with a value of false will be automatically removed. Secondly, you can combine array_map and conditional judgment to perform preliminary screening while converting data, but pay attention to the problem of null value processing. Finally, manual control using foreach loops is suitable for beginners or complex conditional processing. Although it is not as concise as functional writing, it is more intuitive and easy to debug.

2025-07-05 comment 0  455

Article Introduction：To clean up null or null values ??in PHP arrays, you can use the array_filter function, which will remove all false values ??such as null, empty strings, false, 0 and empty arrays by default. If you want to remove only null and empty strings, you need to customize the filtering conditions to retain other false values; use array_values ??to re-index the array key names; recursive filtering is required when dealing with multi-dimensional arrays; pay attention to spaces, data types and performance issues. 1. Use array_filter to filter false values ??by default; 2. Custom callbacks retain specific values; 3. Array_values ??reset key names; 4. Recursive functions handle multi-dimensional arrays; 5. Pay attention to the impact of spaces, types and performance.

2025-07-04 comment 0  915

Article Introduction：The security risks of PHP sessions mainly include session hijacking, session fixation, session prediction and session poisoning. 1. Session hijacking can be prevented by using HTTPS and protecting cookies. 2. Session fixation can be avoided by regenerating the session ID before the user logs in. 3. Session prediction needs to ensure the randomness and unpredictability of session IDs. 4. Session poisoning can be prevented by verifying and filtering session data.

2025-04-28 comment 0  889

Article Introduction：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

2025-02-08 comment 0  921

Article Introduction：To make an object a generator, you need to generate values ??on demand by defining a function containing yield, implementing iterable classes that implement \_\_iter\_ and \_next\_ methods, or using generator expressions. 1. Define a function containing yield, return the generator object when called and generate values ??successively; 2. Implement the \_\_iter\_\_ and \_\_next\_\_\_ in a custom class to control iterative logic; 3. Use generator expressions to quickly create a lightweight generator, suitable for simple transformations or filtering. These methods avoid loading all data into memory, thereby improving memory efficiency.

2025-07-07 comment 0  950

Article Introduction：In PHP, $_GET, $_POST, and $_REQUEST are used to collect data from HTTP requests, but for different purposes. 1.$_GET is used to retrieve non-sensitive data through URL query strings, suitable for scenarios such as filtering content, paging links, etc.; 2.$_POST is used to process sensitive or large amounts of data submitted through HTML forms, such as login information and file uploads; 3.$_REQUEST is a collection of $_GET, $_POST and $_COOKIE, providing a unified access method, but may cause conflicts. It is recommended to use $_GET or $_POST first to avoid ambiguity and security risks.

2025-06-11 comment 0  584

Article Introduction：There are three main ways to remove a specific key from a PHP array. 1. Use the unset() function to directly delete one or more keys, such as unset($array['age']) or unset($array['age'],$array['email']), but this method will modify the original array; 2. Use array_filter() and combine the ARRAY_FILTER_USE_KEY parameter to implement conditional filtering, such as dynamically removing the specified key list, this method generates a new array without affecting the original array; 3. Use array_diff_key() for set key removal, and provide a new array with the format key to be removed, such as array_di

2025-07-06 comment 0  685

Article Introduction：To monitor queued tasks in Laravel's Telescope, you need to manually add the listening event. 1. Open the app/Providers/TelescopeServiceProvider.php file; 2. Introduce and listen to the JobQueued event in the register() method; 3. After the configuration is completed, you can view the detailed information of the queuedjob under the Jobs tag of Telescope, including the task class name, queue name and enqueue parameters. This method is suitable for Redis or database-driven queues and supports monitoring of delayed tasks. Note that filtering rules and data security policies should be set reasonably in the online environment to avoid performance problems and sensitive information

2025-06-27 comment 0  533

Article Introduction：Yii's query builder is a powerful tool that allows developers to build secure and readable database queries through PHP methods. 1. It generates SELECT, INSERT, UPDATE and DELETE statements through object-oriented method to reduce the risk of SQL injection. 2. Query construction adopts chain calling methods, such as select(), from(), where() and other methods to dynamically construct query conditions. 3. Supports complex query logic, including dynamic condition filtering, OR logical grouping and nested queries. 4. It not only supports data retrieval, but also supports data writing operations, such as insert(), update() and delete(). 5. It is recommended to use alias to improve the readability of the code

2025-07-06 comment 0  904

Article Introduction：Expression trees are used in C# to represent code as data. They enable developers to analyze, modify, or runtime to generate new code by building a tree structure that describes code operations rather than executing code directly. Its core components include parameter expressions, binary expressions, and lambda expressions. Common uses are LINQtoSQL and ORM (such as EntityFramework), where the expression tree enables C# LINQ queries to be translated into SQL statements. Other uses include dynamic filtering and querying, serialization or scripting systems, simulation frameworks, and dependency injection containers. However, it is more appropriate to use normal functions or lambda expressions without the need for inspection or conversion logic. 1. Construct dynamic query; 2. Translate it into other forms

2025-06-27 comment 0  190

Article Introduction：To mitigate XSS vulnerabilities in PHP applications, we need to start from four aspects: input filtering, output escape, CSP policy and framework security functions. 1. Verify and filter all user input, use filter_var() function to verify the data format, and purify the HTML content through HTMLPurifier; 2. Escape according to the context when output, such as using htmlspecialchars() to process HTML content, and embed JavaScript with json_encode(); 3. Enable content security policy (CSP), set HTTP headers to limit the source of scripts, and you can first use the Report-Only mode to collect information during the development stage; 4. Use the built-in mechanism of the framework, such as Lar

2025-06-19 comment 0  1018

Article Introduction：PHP security vulnerabilities mainly include SQL injection, XSS, CSRF and file upload vulnerabilities. 1. SQL injection tampers with database queries through malicious input. Prevention methods include using preprocessing statements, filtering inputs, and restricting database permissions. 2. XSS attacks harm user data by injecting malicious scripts. They should use htmlspecialchars to escape output, set CSP headers, and filter rich text content. 3. CSRF uses user identity to forge requests, and preventive measures include using one-time tokens, verifying the Referer header, and setting the SameSite attribute of the cookie. 4. File upload vulnerability may cause the server to execute malicious scripts. The policy is to rename files and restrict suffixes and prohibit uploading directories.

2025-07-08 comment 0  171

Article Introduction：To create an object in PHP, you must first define the class and then instantiate it with the new keyword. 1. Classes are blueprints of objects, defining attributes and methods; 2. Create object instances using new; 3. Constructors are used to initialize different data; 4. Access attributes and methods through ->; 5. Pay attention to access control of public, private, and protected; 6. Multiple independent instances can be created, each maintaining its status. For example, after defining the Car class, newCar('red') creates an object and passes a parameter, $myCar->startEngine() calls the method, and each object does not affect each other. Mastering these helps build clearer, scalable applications.

2025-06-24 comment 0  846

Article Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  652

Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w

2025-01-10 comment 0  776

Article Introduction：Conditional Column CountingConsider a table named "Jobs" structured as follows:jobId, jobName, Prioritywhere "Priority" is an integer between 1...

2025-01-10 comment 0  782

Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI What is the Interview Questions CLI? The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview

2025-01-10 comment 0  1403

Article Introduction：Improved Methods for Trimming Leading Zeros in SQL ServerThe conventional approach for trimming leading zeros in SQL Server involves employing the...

2025-01-10 comment 0  603