Can you list the main types of HTTP requests used in web development?

Main types of HTTP requests used in web development:

• GET — requests data from the server. Used to retrieve information.
• POST — sends data to the server, for example, when submitting a form.
• PUT — updates an existing resource on the server.
• DELETE — deletes the specified resource.
• HEAD — requests only the response headers, without the body.
• PATCH — partial update of a resource.

In PHP, these requests are usually handled by checking $_GET, $_POST, and request headers. For example, to handle a POST request with a form, the $_POST array is used.