PHP Include Files

Server-side include (SSI) is used to create functions, headers, footers, or elements that can be reused on multiple pages.

The include (or require) statement gets all the text/code/tags that exist in the specified file and is copied to the file that uses the include statement.

The include file is useful if you need to refer to the same PHP, HTML, or text on multiple pages of the site.

PHP include and Require statements

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

The nclude and require statements are the same, in addition to error handling:

• Require generates a fatal error (E_COMPILE_ERROR) and stops the script
• Include only generates a warning (e_warning), and the script continues

Therefore, if you want to continue execution and output the results to the user, use include if the included file is missing. Otherwise, in framework, CMS, or complex PHP application programming, always use require to reference critical files to the execution stream. This helps improve the security and integrity of your application in the event that a critical file is accidentally lost.

The inclusion of 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 page header needs to be updated, you only need to update the header include file to

Examples of PHP include examples 1

Let's say we have a standard footer file called "footer.php", just like this:

<?phpecho "<p>copyright©2006-". Date ("Y"). "W3school.com.cn</p>";? >

To refer to this footer file in one page, use the Include statement:

Welcome to visit my homepage!

This is a paragraph.

This is another paragraph.

copyright©2006-2016 W3School.com.cn

Example 2

Let's say we have a standard menu file named "menu.php":

<?phpecho ' <a href= "/index.asp" > Home </a>-<a href= "/html/index.asp" >html tutorials </a>-<a href= /css/index.asp >css Tutorials </a>-<a href=/js/index.asp >javascript Tutorials </a>-<a href= "/php/ Index.asp ">php tutorial </a>";? >

This menu file is used for all pages in the site. The specific approach is (we use a <div> element so that we can easily set the style through CSS in the future):

Output Results Home-HTML Tutorial-CSS Tutorial-JavaScript Tutorial-PHP Tutorial Welcome to my homepage!

This is a paragraph.

This is another paragraph.

PHP Include Files