Questions about register_globals settings_PHP tutorial
For various reasons, PHP settings need to rely on the register_globals parameter to be turned on, but it has also become an important security risk. Please see the following piece of code: Remote users can simply pass authenticated as a form variable, even if authenticate_user( ) function returns false, $authenticated will still be set to true. This is a simple example. You may say, my program will not be written like this. In fact, in slightly more complex applications, this mechanism will become a major vulnerability. Therefore, with new versions of PHP, we recommend that users not use this variable to control applications, although we have no plans to remove it in the near future. In order to help users build applications with register_globals set to off, some variables have been added to replace the old ones. Here are 7 new arrays: $_GET - Contains form variables sent via GET $_POST - Contains form variables sent via POST $_COOKIE - Contains HTTP cookie variables $_SERVER - Contains server-side variables (for example: REMOTE_ADDR) $_ENV - Contains environment variables $_REQUEST - A mix of GET variables, POST variables and Cookie variables, variables that come from the user and cannot be trusted. $_SESSION - Contains HTTP variables registered through the session module. These variables, in any scope, are automatically set as global variables and can be called from anywhere without adding the global keyword. For example: function example1() { print $_GET["name"]; // There is no need to write: global $_GET; } Another tip worth mentioning is that adding a record to the $_SESSION array can automatically register it as a session variable , just like you called the session_register() function.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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