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<h1>PHP Include File</h1>
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<p class="intro">Server Side Includes (SSI) are used to create functions, headers,
footers, or elements that will be reused on multiple pages.</p>
<hr />
<h2>Server Side Includes</h2>
<p>You can insert the content of a file into a PHP file before the server
executes it, with the include() or require() function. The two functions are
identical in every way, except how they handle errors. The include() function
generates a warning (but the script will continue execution) while the require()
function generates a fatal error (and the script execution will stop after the
error).</p>
<p>These two functions are used to
create functions, headers, footers, or elements that can be reused on multiple
pages.</p>
<p>This can save the developer a considerable amount of time. This means that
you can create a standard header or menu file that you want all your web pages
to include. When the header needs to be updated, you can only
update this one include file, or when you add a new page to your site, you can simply change the
menu file (instead of updating the links on all web pages).</p>
<hr />
<h2>The include() Function</h2>
<p>The include() function takes all the text in a specified file and copies it
into the file that uses the include function.</p>
<h3>Example 1</h3>
<p>Assume that you have a standard header file, called "header.php". To include
the header file in a page, use the include() function, like this:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><html>
<body></pre>
<pre><?php include("header.php"); ?></pre>
<pre><h1>Welcome to my home page</h1></pre>
<pre><p>Some text</p></pre>
<pre></body>
</html></pre>
</td></tr></table>
<h3>Example 2</h3>
<p>Now, let's assume we have a standard menu file that should be used on all
pages (include files usually have a ".php"
extension). Look at the "menu.php" file below:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table1"><tr><td>
<pre><html>
<body></pre>
<pre><a href="http://www.w3schools.com/default.php">Home</a> |
<a href="http://www.w3schools.com/about.php">About Us</a> |
<a href="http://www.w3schools.com/contact.php">Contact Us</a></pre>
</td></tr></table>
<p>The three files, "default.php", "about.php", and "contact.php"
should all include the "menu.php" file.
Here is the code in "default.php":</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table2"><tr><td>
<pre><?php include("menu.php"); ?></pre>
<pre><h1>Welcome to my home page</h1></pre>
<pre><p>Some text</p></pre>
<pre></body>
</html></pre>
</td></tr></table>
<p>If you look at the source code of the "default.php" in a browser, it will look something like
this:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table3"><tr><td>
<pre><html>
<body>
<a href="default.php">Home</a> |
<a href="about.php">About Us</a> |
<a href="contact.php">Contact Us</a>
<h1>Welcome to my home page</h1>
<p>Some text</p>
</body>
</html></pre>
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