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🗣 Wd提问: php分页websocket

🤖 Ai回答:
我来为您详细介绍PHP分页和WebSocket的实现方法。

PHP分页实现

1、基础分页类

php
<?php
class Pagination {
private $totalItems;
private $itemsPerPage;
private $currentPage;
private $totalPages;
private $url;

public function __construct($totalItems, $itemsPerPage = 10, $currentPage = 1, $url = '') {
$this-totalItems = $totalItems;
$this-itemsPerPage = $itemsPerPage;
$this-currentPage = max(1, $currentPage);
$this-totalPages = ceil($totalItems / $itemsPerPage);
$this-url = $url;
}

public function getOffset() {
return ($this-currentPage 1) * $this-itemsPerPage;
}

public function getLimit() {
return $this-itemsPerPage;
}

public function render() {
if ($this-totalPages <= 1) return '';

$html = '<nav<ul class=pagination';

// 上一页
if ($this-currentPage 1) {
$html .= '<li class=page-item';
$html .= '<a class=page-link href=' 、$this-buildUrl($this-currentPage 1) 、'上一页</a';
$html .= '</li';
}

// 页码
$startPage = max(1, $this-currentPage 2);
$endPage = min($this-totalPages, $this-currentPage + 2);

for ($i = $startPage; $i <= $endPage; $i++) {
$active = $i == $this-currentPage ? ' active' : '';
$html .= '<li class=page-item' 、$active 、'';
$html .= '<a class=page-link href=' 、$this-buildUrl($i) 、'' 、$i 、'</a';
$html .= '</li';
}

// 下一页
if ($this-currentPage < $this-totalPages) {
$html .= '<li class=page-item';
$html .= '<a class=page-link href=' 、$this-buildUrl($this-currentPage + 1) 、'下一页</a';
$html .= '</li';
}

$html .= '</ul</nav';
return $html;
}

private function buildUrl($page) {
if (strpos($this-url, '?') !== false) {
return $this-url 、'&page=' 、$page;
} else {
return $this-url 、'?page=' 、$page;
}
}
}

2、使用示例

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

// 获取总记录数
$stmt = $pdo-query('SELECT COUNT(*) FROM products');
$totalItems = $stmt-fetchColumn();

// 当前页码
$currentPage = isset($_GET['page']) ? (int)$_GET['page'] : 1;

// 创建分页对象
$pagination = new Pagination($totalItems, 10, $currentPage, 'products.php');

// 获取数据
$offset = $pagination-getOffset();
$limit = $pagination-getLimit();

$stmt = $pdo-prepare('SELECT * FROM products LIMIT :offset, :limit');
$stmt-bindValue(':offset', $offset, PDO::PARAM_INT);
$stmt-bindValue(':limit', $limit, PDO::PARAM_INT);
$stmt-execute();
$products = $stmt-fetchAll();

// 显示数据
foreach ($products as $product) {
echo <div{$product['name']} {$product['price']}</div;
}

// 显示分页
echo $pagination-render();
?

WebSocket实现

1、PHP WebSocket服务器

php
<?php
class WebSocketServer {
private $socket;
private $clients = [];

public function __construct($host = '0.0.0.0', $port = 8080) {
$this-socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($this-socket, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($this-socket, $host, $port);
socket_listen($this-socket);

echo WebSocket服务器启动在 {$host}:{$port}\n;
}

public function run() {
while (true) {
$read = $this-clients;
$read[] = $this-socket;
$write = $except = null;

if (socket_select($read, $write, $except, null) === false) {
break;
}

// 新连接
if (in_array($this-socket, $read)) {
$client = socket_accept($this-socket);
$this-handshake($client);
$this-clients[] = $client;

$key = array_search($this-socket, $read);
unset($read[$key]);
}

// 处理客户端消息
foreach ($read as $client) {
$data = socket_read($client, 1024);

if ($data === false strlen($data) == 0) {
// 客户端断开连接
$key = array_search($client, $this-clients);
unset($this-clients[$key]);
socket_close($client);
continue;
}

$decoded = $this-decode($data);
$this-handleMessage($client, $decoded);
}
}
}

private function handshake($client) {
$headers = socket_read($client, 1024);

if (preg_match('/Sec-WebSocket-Key: (.*)\r\n/', $headers, $matches)) {
$key = base64_encode(pack('H*', sha1($matches[1] 、'258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));

$response = HTTP/1.1 101 Switching Protocols\r\n .
Upgrade: websocket\r\n .
Connection: Upgrade\r\n .
Sec-WebSocket-Accept: $key\r\n\r\n;

socket_write($client, $response, strlen($response));
}
}

private function decode($data) {
$length = ord($data[1]) & 127;

if ($length == 126) {
$masks = substr($data, 4, 4);
$data = substr($data, 8);
} elseif ($length == 127) {
$masks = substr($data, 10, 4);
$data = substr($data, 14);
} else {
$masks = substr($data, 2, 4);
$data = substr($data, 6);
}

$decoded = '';
for ($i = 0; $i < strlen($data); $i++) {
$decoded .= $data[$i] ^ $masks[$i % 4];
}

return $decoded;
}

private function encode($text) {
$b1 = 0x80 | (0x1 & 0x0f);
$length = strlen($text);

if ($length <= 125) {
$header = pack('CC', $b1, $length);
} elseif ($length 125 && $length < 65536) {
$header = pack('CCn', $b1, 126, $length);
} else {
$header = pack('CCNN', $b1, 127, $length);
}

return $header 、$text;
}

public function send($client, $message) {
$encoded = $this-encode($message);
socket_write($client, $encoded, strlen($encoded));
}

public function broadcast($message) {
$encoded = $this-encode($message);
foreach ($this-clients as $client) {
socket_write($client, $encoded, strlen($encoded));
}
}

private function handleMessage($client, $message) {
// 处理接收到的消息
$data = json_decode($message, true);

if ($data && isset($data['type'])) {
switch ($data['type']) {
case 'chat':
$response = [
'type' = 'chat',
'message' = $data['message'],
'timestamp' = time()
];
$this-broadcast(json_encode($response));
break;

case 'ping':
$this-send($client, json_encode(['type' = 'pong']));
break;
}
}
}
}

// 启动

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