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include 'filename';

or

require 'filename';

<html>
<head>
<meta charset="utf-8">
<title>tutorialpro.org(tutorialpro.org)</title>
</head>
<body>

<?php include 'header.php'; ?>
<h1>Welcome to my home page!</h1>
<p>Some text.</p>

</body>
</html>

echo '<a href="/">Home</a>
<a href="/html">HTML Tutorial</a>
<a href="/php">PHP Tutorial</a>';

<html>
<head>
<meta charset="utf-8">
<title>tutorialpro.org(tutorialpro.org)</title>
</head>
<body>

<div class="leftmenu">
<?php include 'menu.php'; ?>
</div>
<h1>Welcome to my home page!</h1>
<p>Some text.</p>

</body>
</html>

<?php
$color='red';
$car='BMW';
?>

<html>
<head>
<meta charset="utf-8">
<title>tutorialpro.org(tutorialpro.org)</title>
</head>
<body>

<h1>Welcome to my home page!</h1>
<?php 
include 'vars.php';
echo "I have a $color $car"; // I have a red BMW
?>

</body>
</html>