Super simple horizontal gauge or progress bar in PHP + HTML

Yesterday I was coding a small piece of PHP code when suddenly I needed to display, in a fashionable way, an affinity value between two elements.

After digging a while for jQuery plugins or PHP code I decided to go for my own solution, cause the ready to use solutions where full of useless fancy fetures and animations.
Aas usual I prefer a simple solution, with a very few lines of code.

Here is the result :