此PHP的語法錯誤

Question

此代碼向我提供語法錯誤，其上帶有'else'。任何建議，謝謝！

<?php 
if($_SESSION['id']) 
echo '<div id="center" class="column">'; 
include("center.php"); 
echo'</div> 
<div id="left" class="column">'; 
include("leftbar.php"); 
echo'</div> 
<div id="right" class="column">'; 
include("rightbar.php"); 
echo '</div>'; 
else 
echo '<h1>Staff please, <a href="index.php">login</a> 
before accessing this page, no access to students.</h1>'; 
?> 

Answer 1

是的，我的建議是使用括號。現在你的代碼基本上是這樣讀取的：

<?php 
if($_SESSION['id']) { 
    echo '<div id="center" class="column">'; 
} 
include("center.php"); 
echo'</div> 
<div id="left" class="column">'; 
include("leftbar.php"); 
echo'</div> 
<div id="right" class="column">'; 
include("rightbar.php"); 
echo '</div>'; 
} else {} <--- error is here because there is no open if statement since you didn't use brackets 
echo '<h1>Staff please, <a href="index.php">login</a> 
before accessing this page, no access to students.</h1>'; 
?> 

請注意，由於您沒有使用括號，因此您的條件僅適用於以下代碼行。當解析器碰到else行時，如果else與其相關，則沒有開放條件。

您的代碼應該這樣寫：

<?php 
if($_SESSION['id']) { 
    echo '<div id="center" class="column">'; 
    include("center.php"); 
    echo'</div><div id="left" class="column">'; 
    include("leftbar.php"); 
    echo'</div><div id="right" class="column">'; 
    include("rightbar.php"); 
    echo '</div>'; 
} else { 
    echo '<h1>Staff please, <a href="index.php">login</a> before accessing this page, no access to students.</h1>'; 
} 
?> 

Answer 2

你需要把它們放在一個塊內。 Block開始於{，結束於}。

if($_SESSION['id']) { 
    echo '<div id="center" class="column">'; 
    include("center.php"); 
    echo'</div> 
    <div id="left" class="column">'; 
    include("leftbar.php"); 
    echo'</div> 
    <div id="right" class="column">'; 
    include("rightbar.php"); 
    echo '</div>'; 
} 
else { 
    echo '<h1>Staff please, <a href="index.php">login</a> 
    before accessing this page, no access to students.</h1>'; 
} 

---

P.S：我會建議使用isset()如果條件內。像這樣：

if(isset($_SESSION['id'])) {