Question

每次我登录时,密码就从数据库中删除。其余的数据完好无损。我是网络编程的初学者, 我对此一无所知。可能的原因是什么?

[从评论中抄取的代码]

$user= $_POST[ username ]; 
$pass = $_POST[ password ]; 
if((isset($user))&&(isset($pass))) { 
  $query ="Select password from table1 where user_name= ".$user." "; 
  $result = mysql_query($query) or die(); 
  $r= mysql_fetch_assoc($result) or die(); 

  if(!strcmp($pass, $r)) { 
   echo "succesful"; 
   session_start(); 
   $_SESSION[ username ]=$user; 
   $_SESSION[ logged ]=1; 
   header("Refresh: 0; URL = ..homeindex.php"); 
  } 
}

Answer 1

您需要做 session_ start 在第一行, 当选中设置为( $_ POST[ 用户名] 时)

session_start(); 
$user= isset($_POST[ username ]) ? trim($_POST[ username ]) : false; 
$password = isset($_POST[ password ]) ? trim($_POST[ password ]) : false; 

if($user !== false && $password !== false) {

当您这样做正确时:

$r= mysql_fetch_assoc($result) or die(); 
if(!strcmp($pass, $r[ password ])) {

页眉 :

header("Location: ..homeindex.php");

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