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This article mainly introduces "the usage and difference of PHP include and require sentences". In daily operation, I believe that many people have doubts about the usage and difference between PHP include and require sentences. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods, hoping to help you answer the doubts about "the usage and difference between PHP include and require sentences". Next, please follow the editor to study!

The server side contains (SSI) to create functions, headers, footers, or elements that can be reused on multiple pages.

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'

PHP include instance

Example 1

Suppose we have a standard footer file called "footer.php", like this:

To reference this footer file in a page, use the include statement:

Welcome to our home page!

A piece of text.

A piece of text.

Example 2

Suppose we have a standard menu file called "menu.php":

All pages in the site use this menu file. Here's what to do (we used an element so that we could easily set the style through CSS in the future):

Welcome to my home page!

Some text.

Some more text.

Example 3

Suppose we have a file called "vars.php" that defines some variables:

Then, if we reference the "vars.php" file, we can use these variables in the call file:

Welcome to my home page! At this point, the study on the usage and difference between PHP include and require sentences is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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