Why does php use apache?

Apache is a Web server: Provides external data and file acquisition functions based on protocols such as Http/Https/Websocket

PHP is a programmable scripting language: Provides basic calculation and logic processing functions, and can be well applied to the development of Web website functional requirements (recommended learning: PHP programming from entry to proficiency)

The relationship between Apache and the PHP interpreter is the relationship between calling and being called. Apache actively calls the PHP interpreter to execute the PHP script file, and the PHP interpreter is called by Apache.

For example, if I enter the address into the client browser, it will find the server 192.168.1.100, and then find the apache server based on the port.

apache will return the code in index.html in a certain directory to the client's browser through the URL address, and then the browser will parse the returned code into the web page content we see. . This is what happens when we access the code of a web page.

What if we are accessing php files

Apache is web server software. It can accept requests from clients for protocols such as Http/Https. When the requested file When it is a PHP script file, it will call the PHP interpreter to interpret and execute the content in the script, encapsulate the results returned by the interpreter into data in the corresponding format according to the corresponding protocol rules, and then return the data to the requesting client end.

For example, when you enter it in the client browser, it will also send this address to apache in 192.168.1.100. When apache sees that the file you passed is a Php file, if the server does not have PHP installed, , he will also open the file and return all the code inside to the client, but the client browser cannot parse the php file.

So the front desk will display all the code of this file, or there will be a situation of downloading this file. This is not what we want to see.

So we need to install a php service on the server side, so that when apache sees that the file you sent is a php file, it will pass the file to the php program first, and the php program will first interpret the file. .

Then he returns to apache, and apache returns to the client. In this way, the client can see the page effect after parsing the php file.

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