php作业提交系统源码解释

<?php
// 连接数据库
$conn = new mysqli("localhost", "username", "password", "database_name");

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 处理文件上传
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_FILES['assignment'])) {
    $file = $_FILES['assignment'];
    $filename = $file['name'];
    $filepath = "uploads/" . $filename;

    // 移动上传的文件到指定目录
    if (move_uploaded_file($file['tmp_name'], $filepath)) {
        // 插入数据库记录
        $stmt = $conn->prepare("INSERT INTO assignments (filename, filepath, submitted_at) VALUES (?, ?, NOW())");
        $stmt->bind_param("ss", $filename, $filepath);
        $stmt->execute();

        echo "作业提交成功！";
    } else {
        echo "文件上传失败！";
    }
}
?>

<!-- HTML表单 -->
<form action="" method="post" enctype="multipart/form-data">
    <input type="file" name="assignment" required>
    <button type="submit">提交作业</button>
</form>