PHP long connection use case analysis
This time I will bring you a case analysis of PHP long connection usage. What are the precautions when using PHP long connection? The following is a practical case, let’s take a look.
Long Polling Technology
Hold a connection on the server side and do not return immediately until there is data. Return, this is the principle of long connection technology
The key to long connection technology is to hold an HTTP request and not respond to the request until there is new data, and then the client automatically initiates a long connection request again.
How to hold a request? The server-side code may look like this
set_time_limit(0); //这句很重要, 不至于运行超时
while (true) {
if (hasNewMessage()) {
echo json_encode(getNewMessage());
break;
}
usleep(100000); //避免太过频繁的查询
}Yes, it is to hold a request through a loop so as not to return immediately. The request will be responded to after new data is queried. Then the client processes the data , initiate a long connection request again.
The client code is like this
<script type="text/javascript">
(function longPolling() {
$.ajax({
'url': 'server.php',
'data': data,
'dataType': 'json',
'success': function(data) {
processData(data);
longPolling();
},
'error': function(data) {
longPolling();
}
});
})();
</script>A simple chat room
Through long connections, we can develop a simple web chat room
Next, we develop a simple web chat room through redis
1. When each client initiates a long connection, on the server The client generates a message queue corresponding to the user. Then it monitors whether there is new data, returns the data to the client for processing, and initiates a long connection request again.
2. When each client initiates a message, Broadcast the message queue.
The following is a code snippet:
<?php
namespace church\LongPolling;
use Closure;
use church\LongPolling\Queue\RedisQueue;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\JsonResponse;
class Server
{
public $event = [];
public $redisQueue = null;
public $request = null;
public $response = null;
public function construct()
{
$this->redisQueue = new RedisQueue();
$this->request = Request::createFromGlobals();
$this->response = new JsonResponse();
}
public function on($event, Closure $closure)
{
if (is_callable($closure)) {
$this->event[$event][] = $closure;
}
}
public function fire($event)
{
if (isset($this->event[$event])) {
foreach ($this->event[$event] as $callback) {
call_user_func($callback, $this);
}
}
}
public function sendMessage($data)
{
switch ($data['type']) {
case 'unicast': //单播
$this->unicast($data['target'], $data['data'], $data['resource']);
break;
case 'multicast': //组播
foreach ($data['target'] as $target) {
$this->unicast($target, $data['data'], $data['resource']);
}
break;
case 'broadcast': //广播
foreach ($this->redisQueue->setQueueName('connections') as $target) {
$this->unicast($target, $data['data'], $data['resource']);
}
break;
}
$this->fire('message');
}
public function unicast($target, $message, $resource = 'system')
{
$redis_queue = new RedisQueue();
$redis_queue->setQueueName($target)->push($resource . ':' . $message);
}
public function getMessage($target)
{
return $this->redisQueue->setQueueName($target)->pop();
}
public function hasMessage($target)
{
return count($this->redisQueue->setQueueName($target));
}
public function run()
{
$data = $this->request->request;
while (true) {
if ($data->get('action') == 'getMessage') {
if ($this->hasMessage($data->get('target'))) {
$this->response->setData([
'state' => 'ok',
'message' => '获取成功',
'data' => $this->getMessage($data->get('target'))
]);
$this->response->send();
break;
}
} elseif ($data->get('action') == 'connect') {
$exist = false;
foreach ($this->redisQueue->setQueueName('connections') as $connection) {
if ($connection == $data->get('data')) {
$exist = true;
}
}
if (! $exist) {
$this->redisQueue->setQueueName('connections')->push($data->get('data'));
}
$this->fire('connect');
break;
}
usleep(100000);
}
}
}Long connections avoid too frequent polling. However, maintaining a long connection on the server also consumes additional resources. Performance during large concurrency Not ideal. You can consider using
in small applications. It is also recommended that the client uses the websocket protocol of html5 and the server uses swoole.
I believe you have already read the case in this article After mastering the method, please pay attention to other related articles on the php Chinese website for more exciting content!
Recommended reading:
Detailed explanation of the use of php namespace
##How to convert Chinese characters and pinyin with PHP Chinese tool class ChineseUtil
The above is the detailed content of PHP long connection use case analysis. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1666
14
1425
52
1327
25
1273
29
1252
24
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
