I wrote a website using html, css, and js, but when customers register personal information, if localstorage is not used, where should this information be stored? In php language the data is saved in Mysql but in this case I don't know what to do.
A web application usually has client-side and server-side components.
To save data (without using localStorage), this usually needs to be done on the server side. MySQL you mentioned is a server side technology, so is PHP. PHP cannot run in a browser; it can only generate client-side code (i.e. HTML, CSS, JS) that ultimately runs on the browser.
JavaScript, HTML, and CSS work together to create the client-side portion of the application. JavaScript is also available as a server-side technology, in the form of Node.js, but most people only use "JavaScript" for browser-based JavaScript.
(As a side note - there are services that can be used as server-side storage that you don't need to manage yourself, like Firebase. Even though it's not on your server, it's still server-side.)
Therefore, using "use html, css, js" is not limited to using PHP (or Python, Ruby, Node.js, or any other available server-side technology). When you want to store data, you usually need both.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
A web application usually has client-side and server-side components.
To save data (without using
localStorage), this usually needs to be done on the server side. MySQL you mentioned is a server side technology, so is PHP. PHP cannot run in a browser; it can only generate client-side code (i.e. HTML, CSS, JS) that ultimately runs on the browser.JavaScript, HTML, and CSS work together to create the client-side portion of the application. JavaScript is also available as a server-side technology, in the form of Node.js, but most people only use "JavaScript" for browser-based JavaScript.
(As a side note - there are services that can be used as server-side storage that you don't need to manage yourself, like Firebase. Even though it's not on your server, it's still server-side.)
Therefore, using "use html, css, js" is not limited to using PHP (or Python, Ruby, Node.js, or any other available server-side technology). When you want to store data, you usually need both.