Hypertext Transfer Protocol (HTTP)
Distinguishing between server-side and client-side
Handling form data using superglobal arrays
Working with cookies
Persisting data in sessions
One of the keys to understanding PHP’s role in the Web is to understand how the Web works at a fundamental level. This generally involves a basic understanding of HTTP, Hypertext Transfer Protocol. To examine the basic operation of the Web, consider a typical HTTP client, your Web browser. When you visit a URL such as http://example.org/, your browser sends ...