Found a total of 10000 related content
PHP implements filtering various HTML tags_PHP tutorial
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
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1304
What are some common security risks associated with PHP sessions?
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
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889
What are the differences between $_GET, $_POST, and $_REQUEST superglobals, and when should each be used?
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
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585
How can Cross-Site Scripting (XSS) vulnerabilities be mitigated in PHP applications?
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
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1018
How do you implement custom session handling in PHP?
Article Introduction：Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.
2025-04-24
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704
What is serialization in PHP and what are potential security risks?
Article Introduction：Serialization in PHP is a process of converting objects or data structures into strings, which are mainly implemented through serialize() and unserialize() functions. Serialization is used to save object state for delivery between different requests or systems. Potential security risks include object injection attacks and information leakage. Avoiding methods include: 1. Limit deserialized classes and use the second parameter of the unserialize() function; 2. Verify the data source to ensure it comes from a trusted source; 3. Consider using more secure data formats such as JSON.
2025-04-02
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1173
Monitoring Queued Jobs Telescope | Queue Inspection
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
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534
How do I create objects from classes in PHP?
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
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846
What are common PHP Security vulnerabilities and prevention methods?
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
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176
Dave The Diver: How To Catch Spider Crabs
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
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Prepare for Interview Like a Pro with Interview Questions CLI
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
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1405
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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