What is the role of PHP?

PHP, "Hypertext Preprocessor", is a general open source scripting language. PHP is a scripting language executed on the server side. It is similar to C language and is a commonly used website programming language. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It is conducive to learning and widely used. It is mainly suitable for the field of web development.

#What is the role of PHP? What can it do?

PHP is a server-side scripting language, a scripting language commonly used for web application development that can dynamically generate web pages. Compared with other programming languages, PHP is more standardized and its syntax is simple and easy to learn.

1. Collect form data:

Regarding this point, a form is a commonly used data input interface for programming. When a form is submitted, the get or post methods are usually used to send the data to the PHP program script for processing.

2. Generate dynamic web pages:

php runs on the server. It can dynamically output the content requested by the user through different requests from the client and running different scripts. In short, client-request-->php server-running output-->client. In this process, the client cannot see the running process of the php program.

3. String processing:

Most of the time when programming is manipulating strings, string processing skills are a necessary ability. PHP treats strings as a basic data type.

4. Dynamically output images:

php uses the GD extension library to dynamically output images. For example, text buttons, verification codes, data charts, image editing, thumbnails, adding watermarks, etc.

5. Process the server-side file system:

Use the file system operation function to operate the directory or file in the server. Including operations such as open, edit, copy, create, delete and file properties.

6. Writing a web page supported by the database:

is actually the process of using php scripts to run to interact with the database. First, there is a user request, and then PHP runs and interacts with the database, and the interactive result set is fed back to the client user.

7. Session tracking control:

HTTP protocol is a stateless protocol, and there is no mechanism to maintain the state between two things. Therefore, PHP uses the idea of ​​session control to track users, in order to ensure that when the user requests one page and then requests another page, he knows that the request is from the same user. It is common for major websites to save login settings and shopping carts in various malls, and save this information for users within a cycle.

8. Processing XML/json files

To put it simply, these files are processed through various extensions through PHP.

9. Supports the use of a large number of network protocols:

php supports the use of various protocol services and can open original network ports so that various protocols can work together.

10. Other operations on the server side:

For example, online payment programs in the field of e-commerce, etc. And it can be used on all mainstream operating systems such as windows, linux, ios, etc.

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