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php弹幕实现

2026-02-14 15:53:50PHP

PHP弹幕实现方法

弹幕功能的实现通常需要结合前端和后端技术，PHP负责后端数据处理和存储。以下是实现弹幕功能的关键步骤：

数据库设计 创建弹幕数据表，包含字段如id、content、color、position、time等。MySQL示例：

CREATE TABLE danmu (
    id INT AUTO_INCREMENT PRIMARY KEY,
    content TEXT NOT NULL,
    color VARCHAR(10) DEFAULT '#FFFFFF',
    position INT DEFAULT 0,
    time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    video_id INT NOT NULL
);

弹幕提交接口 创建PHP接口接收前端提交的弹幕数据：

<?php
header('Content-Type: application/json');
$data = json_decode(file_get_contents('php://input'), true);

// 验证数据
if(empty($data['content']) || empty($data['video_id'])) {
    echo json_encode(['status' => 'error', 'message' => '缺少必要参数']);
    exit;
}

// 数据库连接
$pdo = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');

// 插入弹幕
$stmt = $pdo->prepare("INSERT INTO danmu (content, color, position, video_id) VALUES (?, ?, ?, ?)");
$result = $stmt->execute([
    htmlspecialchars($data['content']),
    $data['color'] ?? '#FFFFFF',
    $data['position'] ?? 0,
    $data['video_id']
]);

echo json_encode(['status' => $result ? 'success' : 'error']);

弹幕获取接口 提供获取指定视频弹幕的接口：

<?php
header('Content-Type: application/json');

$videoId = $_GET['video_id'] ?? 0;
if(!$videoId) {
    echo json_encode([]);
    exit;
}

$pdo = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');
$stmt = $pdo->prepare("SELECT * FROM danmu WHERE video_id = ? ORDER BY time ASC");
$stmt->execute([$videoId]);

echo json_encode($stmt->fetchAll(PDO::FETCH_ASSOC));

前端实现 HTML和JavaScript部分实现弹幕显示：

<div id="danmu-container" style="position:relative;width:800px;height:450px;overflow:hidden;">
    <video id="video" width="800" height="450" controls></video>
</div>

<script>
// 获取弹幕
function loadDanmu(videoId) {
    fetch(`get_danmu.php?video_id=${videoId}`)
        .then(response => response.json())
        .then(data => {
            data.forEach(danmu => {
                createDanmuElement(danmu);
            });
        });
}

// 创建弹幕元素
function createDanmuElement(danmu) {
    const container = document.getElementById('danmu-container');
    const danmuEl = document.createElement('div');

    danmuEl.textContent = danmu.content;
    danmuEl.style.color = danmu.color;
    danmuEl.style.position = 'absolute';
    danmuEl.style.whiteSpace = 'nowrap';
    danmuEl.style.top = `${Math.random() * 80}%`;
    danmuEl.style.left = '100%';

    container.appendChild(danmuEl);

    const duration = 8000 + Math.random() * 4000;
    const animation = danmuEl.animate(
        [{left: '100%'}, {left: '-100px'}],
        {duration: duration, easing: 'linear'}
    );

    animation.onfinish = () => danmuEl.remove();
}

// 提交新弹幕
document.getElementById('video').addEventListener('timeupdate', function() {
    // 可以在此处实现根据视频时间发送弹幕
});

// 初始化加载弹幕
loadDanmu(1); // 假设视频ID为1
</script>

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