我正在构建一个Login函数,由于某种原因我的$ _SESSION变量没有得到任何值,如果他们这样做,我会尝试echo
他们,但他们不会显示。
这是我试图设置它们的地方:
function login()
{
$db=new Database();
session_start();
if(isset($_POST['login'])){
$username=$_POST['username'];
$password=md5($_POST['password']);
$query=("SELECT * FROM user
WHERE username = '$username'
AND password = '$password'");
$row=$db->select($query);
if(mysqli_num_rows($row)==1)
{
$_SESSION['is_logged_in'] = true;
$_SESSION['id'] = $row['id'];
$_SESSION['username'] = $row['username'];
$_SESSION['name'] = $row['name'];
header('Location: index.php');
}
}
}
在我的index.php
我只有session_start();
和echo $_SESSION['username'];
可能导致这些错误的原因是什么?
我使用它们错了吗?我使用$query
变量错了吗?
任何帮助都是非常苛刻的
编辑:
这是我的config.php
:
<?php
define('DB_HOST','localhost');
define('DB_USER','root');
define('DB_PASS','');
define('DB_NAME','PHPWizard');
?>
这是我的Database.php
:
<?php
class Database{
public $host = DB_HOST;
public $username = DB_USER;
public $password = DB_PASS;
public $db_name = DB_NAME;
public $link;
public $error;
/*
* Class Constructor
*/
public function __construct(){
//Call Connect Function
$this->connect();
}
/*
* Connector
*/
private function connect(){
$this->link = new mysqli($this->host, $this->username, $this->password, $this->db_name);
if(!$this->link){
$this->error = "Connection Failed: ".$this->link->connect_error;
return false;
}
}
/*
* Select
*/
public function select($query){
$result = $this->link->query($query) or die($this->link->error.__LINE__);
if($result->num_rows > 0){
return $result;
} else {
return false;
}
}
/*
* Insert
*/
public function insert($query){
$insert_row = $this->link->query($query) or die($this->link->error.__LINE__);
//Validate Insert
if($insert_row){
header("Location: index.php?msg=".urlencode('Record Added'));
exit();
} else {
die('Error : ('. $this->link->errno .') '. $this->link->error);
}
}
/*
* Update
*/
public function update($query){
$update_row = $this->link->query($query) or die($this->link->error.__LINE__);
//Validate Insert
if($update_row){
header("Location: index.php?msg=".urlencode('Record Updated'));
exit();
} else {
die('Error : ('. $this->link->errno .') '. $this->link->error);
}
}
/*
* Delete
*/
public function delete($query){
$delete_row = $this->link->query($query) or die($this->link->error.__LINE__);
//Validate Insert
if($delete_row){
header("Location: index.php?msg=".urlencode('Record Deleted'));
exit();
} else {
die('Error : ('. $this->link->errno .') '. $this->link->error);
}
}
}
我的联系可能是变量没有得到任何值的原因吗?
答案 0 :(得分:1)
在将$ row用作数组之前,您必须获取数据:
此:
$row = $db->select($query);
$_SESSION['id'] = $row['id'];
应该是:
$result = $db->select($query);
if ($result) {
$row = $result->fetch_assoc();
$_SESSION['id'] = $row['id'];
}