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I am having about one single class with about 3,500 lines of code, the whole website will be based on this class, so if the website has pages likes: member.php, login.php, signup.php, etc... all of them will use that single class to process most of the website functions.<br />
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Can that affect the server memory since it will probably load 3,500 line in the memory each time any member access any page?
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I am having about one single class with about 3,500 lines of code, the whole website will be based on this class, so if the website has pages likes: member.php, login.php, signup.php, etc... all of them will use that single class to process most of the website functions.

Can that affect the server memory since it will probably load 3,500 line in the memory each time any member access any page?

Using single class in the all website script pages

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.

Apache Web Server

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.