Mysqli_select_db（）期望参数1为mysqli，第18行的/storage/ssd3/011/325011/public_HTML/vote/app/login.php中给出的字符串无法选择数据库 [英] Mysqli_select_db() expects parameter 1 to be mysqli, string given in /storage/ssd3/011/325011/public_HTML/vote/app/login.php on line 18 unable to select database
问题描述
<？php
//开始会话
session_start（）;
//数组存储验证错误
$ errmsg_arr = array（）;
//验证错误标志
$ errflag = false;
//连接到mysqli服务器
$ link = mysqli_connect（'localhost'，'id325011_admin'，dddddd） ;
if（！$ link）{
die（'连接服务器失败：'。mysqli_error（））;
} < br $>
//选择数据库
$ db_select = mysqli_select_db（$ link-> conn，id325011_onlinevoting）;
$ db = mysqli_select_db（'id325011_onlinevoting'，$ link）;
if（！$ db）{
die（无法选择数据库）;
}
//清理从表单收到的值的功能。防止SQL注入
函数清理（$ str）{
$ str = @trim（$ str）;
if（get_magic_quotes_gpc（）） {
$ str = stripslashes（$ str）;
}
返回mysqli_real_escape_string（$ str）;
}
//消除POST值
$ login = clean（$ _ POST ['username']）;
$ password = clean（$ _ POST ['password']）;
$ position = clean（$ _ POST ['asas']）;
$ stat = 'notvoted';
//输入验证
if（$ login ==''）{
$ errmsg_arr [] ='用户名缺失';
$ errflag = true;
}
if（$ password ==''）{
$ errmsg_arr [] ='密码丢失';
$ errflag = true;
}
//如果有输入验证，则重定向回登录表格
if（$ errflag）{
$ _SESSION ['ERRMSG_ARR'] = $ errmsg_arr;
s ession_write_close（）;
header（location：index.php）;
exit（）;
}
//创建查询
if（$ position =='Admin'）{
$ qry =SELECT * FROM admin WHERE username ='$ login'AND password ='$ password';
}
if（$ position =='Student'）{
$ qry =SELECT * FROM students WHERE username ='$ login'AND password ='$ password'AND status ='$ stat';
}
$ result = mysqli_query（$ qry）;
//检查查询是否成功
if（$ result）{
if（mysqli_num_rows（$ result）> 0）{
//登录成功
if（$ position =='Student'）{
session_regenerate_id（）;
$ member = mysqli_fetch_assoc（$ result）;
$ _SESSION ['SESS_MEMBER_ID'] = $ member ['username'];
$ _SESSION ['SESS_COURSE '] = $ member ['course'];
$ _SESSION ['NAME'] = $ member ['name'];
session_write_close（）;
header（location：candidates_list.php）;
exit（）;
}
if（$ position = ='Admin'）{
session_regenerate_id（）;
$ member = mysqli_fetch_assoc（$ result）;
$ _SESSION ['SESS_MEMBER_ID'] = $ member ['id'];
session_write_close（）;
header（location：admin / index.php）;
退出（）;
}
}否则{
//登录失败
header（location：index .php）;
退出（）;
}
}否则{
di e（查询失败）;
}
？>
我有什么试过：
$ db = mysqli_select_db（'id325011_onlinevoting'，$ link）;
< blockquote> errmsg_arr = array（）;
//验证错误标志
errflag = false;
//连接到mysqli服务器
link = mysqli_connect（'localhost'，'id325011_admin'，dddddd ）;
if（！
<?php
//Start session
session_start();
//Array to store validation errors
$errmsg_arr = array();
//Validation error flag
$errflag = false;
//Connect to mysqli server
$link = mysqli_connect('localhost','id325011_admin',"dddddd");
if(!$link) {
die('Failed to connect to server: ' . mysqli_error());
}
//Select database
$db_select = mysqli_select_db($link->conn, id325011_onlinevoting );
$db = mysqli_select_db('id325011_onlinevoting', $link);
if(!$db) {
die("Unable to select database");
}
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
$str = @trim($str);
if(get_magic_quotes_gpc()) {
$str = stripslashes($str);
}
return mysqli_real_escape_string($str);
}
//Sanitize the POST values
$login = clean($_POST['username']);
$password = clean($_POST['password']);
$position = clean($_POST['asas']);
$stat='notvoted';
//Input Validations
if($login == '') {
$errmsg_arr[] = 'Username missing';
$errflag = true;
}
if($password == '') {
$errmsg_arr[] = 'Password missing';
$errflag = true;
}
//If there are input validations, redirect back to the login form
if($errflag) {
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
session_write_close();
header("location: index.php");
exit();
}
//Create query
if($position=='Admin') {
$qry="SELECT * FROM admin WHERE username='$login' AND password='$password'";
}
if($position=='Student') {
$qry="SELECT * FROM students WHERE username='$login' AND password='$password' AND status='$stat'";
}
$result=mysqli_query($qry);
//Check whether the query was successful or not
if($result) {
if(mysqli_num_rows($result) > 0) {
//Login Successful
if($position=='Student') {
session_regenerate_id();
$member = mysqli_fetch_assoc($result);
$_SESSION['SESS_MEMBER_ID'] = $member['username'];
$_SESSION['SESS_COURSE'] = $member['course'];
$_SESSION['NAME'] = $member['name'];
session_write_close();
header("location: candidates_list.php");
exit();
}
if($position=='Admin') {
session_regenerate_id();
$member = mysqli_fetch_assoc($result);
$_SESSION['SESS_MEMBER_ID'] = $member['id'];
session_write_close();
header("location: admin/index.php");
exit();
}
}else {
//Login failed
header("location: index.php");
exit();
}
}else {
die("Query failed");
}
?>
What I have tried:
$db = mysqli_select_db('id325011_onlinevoting', $link);
errmsg_arr = array();
//Validation error flag
errflag = false;
//Connect to mysqli server
link = mysqli_connect('localhost','id325011_admin',"dddddd");
if(!
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