一步步教你如何用PHP開發新聞發佈網站

<?php
$db_host = 'localhost';
$db_username = 'root';
$db_password = 'password';
$db_name = 'news';

$conn = new mysqli($db_host, $db_username, $db_password, $db_name);

if ($conn->connect_error) {
    die("数据库连接失败：" . $conn->connect_error);
}

<?php
include 'db_connect.php';

$category = $_GET['category'];

$sql = "SELECT * FROM news_articles WHERE category='$category'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "<h3>" . $row['title'] . "</h3>";
        echo "<p>" . $row['content'] . "</p>";
    }
} else {
    echo "暂无新闻";
}

$conn->close();

<?php
include 'db_connect.php';

$id = $_GET['id'];

$sql = "SELECT * FROM news_articles WHERE id='$id'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    echo "<h1>" . $row['title'] . "</h1>";
    echo "<p>" . $row['content'] . "</p>";
} else {
    echo "新闻不存在";
}

$conn->close();

<?php
include 'db_connect.php';

$sql = "SELECT * FROM news_articles ORDER BY timestamp DESC";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "<h3>" . $row['title'] . "</h3>";
        echo "<p>" . $row['content'] . "</p>";
    }
} else {
    echo "暂无新闻";
}

$conn->close();

<?php
include 'db_connect.php';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $category = $_POST['category'];
    $title = $_POST['title'];
    $content = $_POST['content'];
    $timestamp = date('Y-m-d H:i:s');

    $sql = "INSERT INTO news_articles (category, title, content, timestamp) VALUES ('$category', '$title', '$content', '$timestamp')";
    if ($conn->query($sql) === TRUE) {
        echo "发布成功";
    } else {
        echo "发布失败：" . $conn->error;
    }
}

$conn->close();
?>

<form method="POST" action="admin.php">
    <input type="text" name="category" placeholder="分类" required>
    <input type="text" name="title" placeholder="标题" required>
    <textarea name="content" placeholder="内容" required></textarea>
    <button type="submit">发布新闻</button>
</form>