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header.php
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<?php
session_start();
echo "<!DOCTYPE html>\n<html><head>";
require_once 'functions.php';
$userstr='(Guest)';
if(isset($_SESSION['user']))
{
$user=$_SESSION['user'];
$loggedin=TRUE;
$userstr="($user)";
}
else $loggedin=false;
//檢查SEESION中是否有USER的存在，如果不存在
//即為登出狀態
echo "<title>$appname$userstr</title><link rel='stylesheet' href='style.css' type='text/css'>".
"</head><body><center><canvas id='logo' width='624' height='96'>$appname</canvas></center>".
"<script src='javascript.js'></script><div class ='appname'>$appname$userstr</div> ";
//檢查是否為登出狀態 根據登出登入狀態顯示不同的東西
if($loggedin)
echo "<br><ul class='menu'>".
"<li><a href='members.php?view=$user'>Home</a></li>".
"<li><a href='members.php'>Members</a></li>".
"<li><a href='friends.php'>Friends</a></li>".
"<li><a href='messages.php'>Messages</a></li>".
"<li><a href='profile.php'>Edit Profile</a></li>".
"<li><a href='logout.php'>Log out</a></li></ul><br>";
else {
echo(
"<br><ul class='menu'>".
"<li><a href='index.php'>Home</a></li>".
"<li><a href='signup.php'>Sign up</a></li>".
"<li><a href='login.php'>Log in</a></li></ul><br>".
"<span class='info'> ⇒ You must be logged in to view this page.</span><br><br>"
);
}
?>