PHP实现校园失物管理系统的源码解析

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "campus_lost_found";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
?>

<form method="post" action="submit_lost_item.php">
    <input type="text" name="title" placeholder="失物名称" required>
    <textarea name="description" placeholder="失物描述" required></textarea>
    <!-- 其他字段省略 -->
    <button type="submit">发布失物信息</button>
</form>

<?php
include 'db_connect.php';

$title = $_POST['title'];
$description = $_POST['description'];
$user_id = $_SESSION['user_id'];

$sql = "INSERT INTO lost_items (title, description, user_id) VALUES ('$title', '$description', '$user_id')";

if ($conn->query($sql) === TRUE) {
    echo "失物信息发布成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

<?php
include 'db_connect.php';

$search_query = $_GET['search'];
$sql = "SELECT * FROM lost_items WHERE title LIKE '%$search_query%' OR description LIKE '%$search_query%'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "标题: " . $row["title"]. " - 描述: " . $row["description"]. "<br>";
    }
} else {
    echo "未找到相关失物信息";
}

$conn->close();
?>

<form method="post" action="admin_login.php">
    <input type="text" name="username" placeholder="管理员用户名" required>
    <input type="password" name="password" placeholder="管理员密码" required>
    <button type="submit">登录</button>
</form>

<?php
include 'db_connect.php';

$username = $_POST['username'];
$password = $_POST['password'];

$sql = "SELECT * FROM users WHERE username='$username' AND password='$password' AND is_admin=1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $_SESSION['admin_logged_in'] = true;
    echo "管理员登录成功";
} else {
    echo "管理员用户名或密码错误";
}

$conn->close();
?>