


Analysis of the security principle of using addslashes function escaping in PHP, addslashes escaping
The example in this article describes the analysis of the security principles of using addslashes function escaping in PHP. Share it with everyone for your reference. The specific analysis is as follows:
Let’s first take a look at the prototype of addslashes_deep in ECshop
If (empty($value)) {
return $value; //If it is empty, return directly;
} else {
return is_array($value) ? array_map('addslashes_deep', $value): addslashes($value);
} } //Process the array recursively until all array elements are traversed;
}
There is nothing wrong with the addslashes_deep function itself, but you have to pay attention when using it
I just happened to see someone posting on the Internet today about the BUG injection vulnerability used by this function
This function only escapes the value of the data when referencing the callback function addslashes. Therefore, if the user refers to the keys of the array for specific processing during this process, there is a risk of $key injection. In this case, the addslashes_deep function can be changed to make it At the same time, escape the key value, or explicitly do not quote the key content when using it.
I hope this article will be helpful to everyone’s PHP programming design.
addslashes -- Use backslashes to quote strings
string addslashes ( string str )
Returns a string that needs to be preceded by certain characters for database query statements, etc. Backslash added. These characters are single quote ('), double quote ("), backslash (\) and NUL (NULL character).
An example of using addslashes() is when you want to enter data into a database For example, if you insert the name O'reilly into the database, you need to escape it. Most databases use \ as the escape character: O\'reilly. This will put the data into the database without inserting it. Extra \. When the PHP directive magic_quotes_sybase is set to on, it means that ' will be escaped when inserting '
By default, the PHP directive magic_quotes_gpc is on, which is mainly used for all GET, POST and COOKIE data automatically run addslashes(). Do not use addslashes() on strings that have been escaped by magic_quotes_gpc, because this will cause double-level escaping. You can use the function get_magic_quotes_gpc() to detect this situation.
See if you need to dequote a string escaped using addcslashes. You can use the stripcslashes function to decode it

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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