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Figure 1.1: Web Sites in PHP using Apache
Clients
Client 1
Client 2
Client 3

Apache (Server)

Multiple processes

handling requests

PHP Interpreter
Client requests arrive simultaneously
Step-by-Step Process of How PHP Works
Step 1: A user requests a web page from a server.
Step 2: The server receives the request and sends it to the PHP interpreter.
Step 3: The PHP interpreter reads the PHP code in the requested file and executes it.
Step 4: The PHP code may interact with a database or other resources to generate content.
Step 5: The PHP interpreter generates HTML code based on the output of the PHP code.
Step 6: The server sends the HTML code back to the user's browser.
Step 7: The user's browser renders the HTML code and displays the web page.

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