程式碼的重複利用相當重要
它可以幫助減少程式碼的量以及撰寫時花的力氣
最大的好處是提供了維護的方便性
樣板就是將程式分成功能性元件
以下將提供範例：
原件成員：
startsession.php==========
<?php
session_start();
// If the session vars aren't set, try to set them with a cookie
if (!isset($_SESSION['user_id'])) {
if (isset($_COOKIE['user_id']) && isset($_COOKIE['username'])) {
$_SESSION['user_id'] = $_COOKIE['user_id'];
$_SESSION['username'] = $_COOKIE['username'];
}
}
?>
header.php======
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
echo '<title>Mismatch - ' . $page_title . '</title>';
?>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<?php
echo '<h3>Mismatch - ' . $page_title . '</h3>';
?>
navmenu.php==========
<?php
// Generate the navigation menu
echo '<hr />';
if (isset($_SESSION['username'])) {
echo '<a href="index.php">Home</a> ❤ ';
echo '<a href="viewprofile.php">View Profile</a> ❤ ';
echo '<a href="editprofile.php">Edit Profile</a> ❤ ';
echo '<a href="logout.php">Log Out (' . $_SESSION['username'] . ')</a>';
}
else {
echo '<a href="login.php">Log In</a> ❤ ';
echo '<a href="signup.php">Sign Up</a>';
}
echo '<hr />';
?>
footer.php==========
<hr />
<p class="footer">Copyright ©2008 Mismatch Enterprises, Inc.</p>
</body>
</html>
完成品：
index.php============
<?php
// Start the session
require_once('startsession.php');
// Insert the page header
$page_title = 'Where opposites attract!';
require_once('header.php');
require_once('appvars.php');
require_once('connectvars.php');
// Show the navigation menu
require_once('navmenu.php');
// Connect to the database
$dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
// Retrieve the user data from MySQL
$query = "SELECT user_id, first_name, picture FROM mismatch_user WHERE first_name IS NOT NULL ORDER BY join_date DESC LIMIT 5";
$data = mysqli_query($dbc, $query);
// Loop through the array of user data, formatting it as HTML
echo '<h4>Latest members:</h4>';
echo '<table>';
while ($row = mysqli_fetch_array($data)) {
if (is_file(MM_UPLOADPATH . $row['picture']) && filesize(MM_UPLOADPATH . $row['picture']) > 0) {
echo '<tr><td><img src="' . MM_UPLOADPATH . $row['picture'] . '" alt="' . $row['first_name'] . '" /></td>';
}
else {
echo '<tr><td><img src="' . MM_UPLOADPATH . 'nopic.jpg' . '" alt="' . $row['first_name'] . '" /></td>';
}
if (isset($_SESSION['user_id'])) {
echo '<td><a href="viewprofile.php?user_id=' . $row['user_id'] . '">' . $row['first_name'] . '</a></td></tr>';
}
else {
echo '<td>' . $row['first_name'] . '</td></tr>';
}
}
echo '</table>';
mysqli_close($dbc);
?>
<?php
// Insert the page footer
require_once('footer.php');
?>
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