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PHP Include File
PHP Include
Without understanding much about the details of PHP, you can save yourself a great deal of time with the use of the PHP include command. include takes a file name and simply inserts that file's contents into the script that issued the include command.
Why is this a cool thing? Well, first of all, this means that you can type up a common header or menu file that you want all your web pages to include. When you add a new page to your site, instead of having to update the links on several web pages, you can simply change the Menu file.
An Include Example
Say we wanted to create a common menu file that all our pages will use. A common practice for naming files that are to be included is to use the ".php" extension. Since we want to create a common menu let's save it as "menu.php".
<html>
<body>
<a href="http://www.hiscript.com/index.php">Home</a> -
<a href="http://www.hiscript.com/about.php">About Us</a> -
<a href="http://www.hiscript.com/links.php">Links</a> -
<a href="http://www.hiscript.com/contact.php">Contact Us</a> <br />
Save the above file as "menu.php". Now create a new file, "index.php" in the same directory as "menu.php". Here we will take advantage of the include command to add our common menu.
What do Visitors See
If we were to use the include command to insert a menu on each of our web pages, what would the visitor see if they viewed the source of "index.php"? Well, because the include command is pretty much the same as copying and pasting, the visitors would see:
<html>
<body>
<a href="index.php">Home</a> -
<a href="left.php">Left</a> -
<a href="links.php">Links</a> -
<a href="contact.php">Contact Us</a> <br />
<p>This is my home page that uses a common menu to save me time when I add
new pages to my website!</p>
</body>
</html>
The visitor would actually see all the HTML code as one long line of HTML code, because we have not inserted any new line characters. We did some formatting above to make it easier to read. We will be discussing new line characters later.
Include Recap
The include command simply takes all the text that exists in the specified file and copies it into the file that uses the include command. Include is quite useful when you want to include the same PHP, HTML, or text segment on multiple pages of a website. The include command is used widely by PHP web developers. Like PHP Echo, include is not a function, but a language construct.
The next lesson will talk about a slight variation of the include command: require. It is often best to use the require command instead of the include command in your PHP Code. Read the next lesson to find out why!