Security
Code obsolescence - how to maintain compatibility2022-07-29T15:10:00.000Z
When developing large systems (e.g., enterprise applications, shared software packages, libraries, …) where multiple layers and developers communicate with each other, the problem of how to handle the release of new code versions arises. Let's look a…
Refactoring a legacy PHP project - how to catch up on technology debt2021-05-11T18:45:00.000Z
When consulting with knowledgeable and experienced project owners, I often come across the question of the long-term sustainability of a digital project. Many large projects that exceed 3 years of development start to become internally obsolete and a…
GitHub Actions - the best CI for 20212021-02-07T14:46:39.000Z
Since you've been developing web applications for a while now, you've probably noticed that many things are routinely repetitive for you, even though they shouldn't be. Very often it's technical project management, file versioning, automated code rev…
Getting the user's IP address in PHP2020-02-28T09:30:21.000Z
In PHP, it is very easy to detect an IP address at a basic level: echo 'You know, your IP address is' . $_SERVER['REMOTE_ADDR'] . '?'; Warning: Getting the IP address as the key of the $_SERVER['REMOTE_ADDR'] field is only possible if PHP was called…
The eval() function in PHP2020-02-16T17:37:20.000Z
The eval function is used to execute the passed string as PHP code. PHP language design and practical features PHP is an interpreted language, which means in particular that its code is evaluated by an interpreter, a special type of program that read…
Safe application2019-10-01T12:19:04.000Z
If you are serious about developing web applications and the site will later be available on the Internet, it is very important to address security. Realistically, the following threats await developers: The application has an internal error, for exa…
Hashing strings and passwords2019-09-11T08:13:30.000Z
The hashing process (as opposed to encryption) produces an output from the input from which the original string can no longer be derived. It is therefore well suited for protecting sensitive strings, passwords and checksums. Another nice feature of h…
Caesar's cipher - how it works2019-08-23T13:43:02.000Z
Warning: This article was written many years ago and some information may be outdated or incorrect. Please bear this in mind when reading. The Caesar cipher is one of the simplest hashing functions. In its day it was virtually unbreakable, but in the…
How to break the md5 function2019-08-23T13:33:10.000Z
MD5 is a very commonly used function for calculating hashes. Beginners often use it for password hashing, which is not a good idea because there are many ways to retrieve the original password. This article describes specific methods for doing so. Ti…
Include security in PHP and file attachment2019-08-22T18:48:46.000Z
Often, we may want to attach a file to a page that we have stored on disk somewhere else. If we enter its exact name directly into the attach function, there is nothing to worry about. Securely attaching a file include 'menu.html'; The previous entry…
Addcslashes2019-08-22T18:48:46.000Z
Support PHP4, PHP5 addcslashes - C-style slash string Description string addcslashes (string $str, string $charlist) Returns a string with backslashes before the characters that are specified in the charlist parameter. Parameters str Text string char…