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Today, the editor will share with you the relevant knowledge points about how to use include in php. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

In PHP, the include statement is used to get all the text, code, and markup that exists in the specified file and copy it into the file that uses the statement, inserting the contents of the PHP file into another PHP file before the server executes.

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What is the use of include in php

The include (or require) statement takes all the text / code / tags that exist in the specified file and copies them to the file that uses the include statement.

Include files are useful if you need to reference the same PHP, HTML, or text on multiple pages of a Web site.

PHP include and require statements

With include or require statements, you can insert the contents of an PHP file into another PHP file (before the server executes it).

The include and require statements are the same, except for error handling:

Require generates a fatal error (E_COMPILE_ERROR) and stops the script

Include only generates warnings (E_WARNING), and the script continues

Therefore, if you want to continue execution and output the results to the user, even if the include file is missing, use include. Otherwise, always use require to reference key files to the execution flow in framework, CMS, or complex PHP application programming. This helps improve the security and integrity of the application in the event of an accidental loss of a critical file.

Including files saves a lot of work. This means that you can create a standard header, footer, or menu file for all pages. Then, when the header needs to be updated, you only need to update the header containing the file.

Grammar

Include 'filename'

Or

Require 'filename'

The public.php file is as follows:

Add include to the include file and add the public file in quotation marks.

Run the include file in the browser to see the results.

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