小编Reb*_*kah的帖子

我创建了一个登录,以便用户可以登录到一个站点,我使用php和phphmyadmin来创建登录,我使用相同的代码为我正在做的另一个项目,它工作正常,但它现在不会工作,不似乎喜欢第15行,我做错了什么.

这是我的代码

<?php
    session_start();
?>

<header id="page_header">

<?php

  include "connect.php";

  if (isset($_POST['username']) and isset($_POST['password'])){

$username = $_POST['username'];

$password = $_POST['password'];

$query = "SELECT * FROM users WHERE username='$username' and password='$password'";

$result = mysqli_query($con, $query) or die(mysqli_error());

$count = mysqli_num_rows($result);

if ($count == 1){

$_SESSION['username'] = $username;

}else {

echo "Invalid Login Credentials.";

}


} 

?>




<div id = "menu">
            <nav>
          <ul>
            <li><img src="../img/buzz_party.png"></li>
              <li><a href="index.php">Home</a></li> &nbsp; &nbsp; &nbsp;
              <li><a href="aboutus.php">About Us</a></li> &nbsp; &nbsp; &nbsp;
              <li><a href="advertising.php">Supplies</a></li> &nbsp; &nbsp; &nbsp;
              <li><a …