So let's say I have a HTML page and an input box on it. The user will type something in it, then I'll store it as a variable in JS, and then, can I somehow write the data of that variable to an already existing JSON file on the server?
How can I achieve this using JavaScript and/or PHP?
EDIT: I actually want to know how to write the data of a PHP variable to a JSON file that is in the same directory as the PHP file.