Steganography with PHP – Hide files in images

Steganographie mit PHPIn this article we want to deal with the topic of steganography and implement a small example in PHP. Because PHP is not “only” used to create web pages or to implement forms, as any experienced PHP programmer of larger web agencies will surely confirm.
Besides functions for text processing, PHP also provides methods for image processing as well as for manipulation on bit and byte level. And these are the ones we want to use today. But before we start coding, we will have a short introduction to the topic of steganography.
Steganography is not shorthand
As the title already announced, today’s topic is steganography, the art of hiding information or knowledge in a carrier medium. Wikipedia defines steganography as follows:
Steganography (/ˌstɛɡəˈnɒɡrəfi/) is the practice of concealing a message within another message or a physical object. In computing/electronic contexts, a computer file, message, image, […]