解析错误：语法错误，意外'if'（T_IF），如何解决它？

Question

我是做一个登录脚本，这是该指数：

<?php 
     session_start() 
     if(isset($_POST['username'])&&!empty($_POST['username'])){ 
     header("location:login.php"); 
    } 
    echo "selamat datang ".$_SESSION['username']; 
    ?> 
    <br/><br/><br/> 
    <a href="logout.php">Logout</a> 

当我尝试它，它告诉我：

Parse error: syntax error, unexpected 'if' (T_IF)

有谁知道？

Answer 1

空间不当，session_start

<?php 
session_start(); 
if(isset($_POST['username']) && !empty($_POST['username'])){ 
    header("location:login.php"); 
} 
echo "selamat datang ".$_SESSION['username']; 
?> 
<br/><br/><br/> 
<a href="logout.php">Logout</a> 

Answer 2

MISSING 后使用;;在session_start后

<?php 
     session_start(); 
     if(isset($_POST['username'])&&!empty($_POST['username'])){ 
     header("location:login.php"); 
    } 
    echo "selamat datang ".$_SESSION['username']; 
    ?> 
    <br/><br/><br/> 
    <a href="logout.php">Logout</a> 

Answer 3

尝试......

<?php 
     session_start(); //miss semicolon 
     if(isset($_POST['username'])&&!empty($_POST['username'])){ 
     header("location:login.php"); 
    } 
    echo "selamat datang ".$_SESSION['username']; 
    ?> 
    <br/><br/><br/> 
    <a href="logout.php">Logout</a>