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Code obsolescence - how to maintain compatibility

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 debt

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 2021

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 PHP

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 PHP

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 application

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 passwords

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 works

Warning: This article was written many years ago and some information may be outdated or incorrect.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 function

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…

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…

Include security in PHP and file attachment

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…

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