Plugin Development using classes – Public & Private Callbacks

Alright, so I’m developing a plugin where my plugin file is a class which holds all the functions related to the initiation of the plugin, such that I can simply provide all of the plugins functionalities by initiating the class. According to a variety of docs, I developed stuff in a way where I hook all of the plugin’s functionalities as callbacks onto the according hooks. Callbacks are defined as public functions in the class, and the callbacks are hooked via the class constructor; like so:

JS value to PHP variable to change div background color with PHP If else statement

I have the below div where i use a PHP if else to change the background color of the div based on the $tteg value which is equal to a JS value called {{ reviewsOverall }} , i don’t know if i did equal them correctly but it seems to work, the problem i am facing is the color of the background is always red, i am not sure if the below code is correct, please help.