A brief analysis of how to install and use swoole

Swoole is a PHP asynchronous network communication engine for production environments. It provides TCP/UDP/Unix Socket ordinary client/server network communication capabilities, as well as corresponding asynchronous file reading and writing, asynchronous MySQL and other asynchronous I/O Operation capabilities allow PHP developers to write high-concurrency and high-performance network service applications without learning complex C/C programming knowledge. They only need to write concise and easy-to-understand PHP code to achieve it.

This article will introduce the installation, basic use, web development and solutions to common problems of Swoole.

1. Install Swoole

The PHP version supported by Swoole is PHP5.3 and above. It can be installed through source code compilation or PECL. The following are two Detailed steps for this method:

Method 1. Compile and install using source code

1. Download Swoole source code

You can download it from Swoole’s official website ( https://www.swoole.com/) Download the latest Swoole source code package.

2. Extract the source code package

Execute the following command in the terminal to decompress the source code package:

tar zxvf swoole-src-4.6.7.tar.gz

3. Enter the decompressed directory and compile and install

Execute the following command in the terminal to enter the decompressed directory, and compile and install:

cd swoole-src-4.6.7
phpize
./configure
make && make install

4. Add the Swoole extension in php.ini

Edit php.ini file, add the following lines at the end:

extension=swoole.so

5. Restart PHP

Restart PHP to make the configuration take effect.

Method 2. Install using PECL

1. Execute the following command to install Swoole

pecl install swoole

2. Manually add the extension in php.ini

Edit the php.ini file and add the following line at the end:

extension=swoole.so

3. Restart PHP

Restart PHP to make the configuration take effect.

2. Basic use

1. Server

The following is a sample code for a simple TCP server:

<?php
$serv = new swoole_server("0.0.0.0", 9501);

$serv->on('connect', function ($serv, $fd) {
    echo "Client: Connect.\n";
});

$serv->on('receive', function ($serv, $fd, $from_id, $data) {
    $serv->send($fd, "Server: " . $data);
});

$serv->on('close', function ($serv, $fd) {
    echo "Client: Close.\n";
});

$serv->start();

The above code creates a TCP server and listens to port 9501. When a client is connected, "Client: Connect." is output; when a client sends data, "Server: Client Data" is returned; when a client disconnects, "Client: Close." is output.

2. Client

The following is a sample code for a simple TCP client:

<?php
$client = new swoole_client(SWOOLE_SOCK_TCP);

if (!$client->connect('127.0.0.1', 9501, -1)) {
    echo "Error: {$client->errCode}\n";
    exit;
}

$client->send("Hello World!");
echo $client->recv();
$client->close();

The above code creates a TCP client and connects to 127.0.0.1:9501 port. Send the "Hello World!" string, wait for the server to return data, and finally close the connection.

3. Web Development

Swoole also supports Web development. You can use the Swoole\Http\Server class to create a Web server, and use Swoole\Http\Request and Swoole\ Http\Response operates requests and responses. The following is a simple example:

<?php
$http = new Swoole\Http\Server("0.0.0.0", 9501);

$http->on('request', function ($request, $response) {
    $response->header("Content-Type", "text/plain");
    $response->end("Hello World\n");
});

$http->start();

The above code creates an HTTP server and listens to port 9501. When requested, the "Hello World" string is returned.

4. Solutions to common problems

1. Common errors: "swoole.so: undefined symbol: uv_loop_size"

Solution: This is because of missing For the libuv library, you can execute the following command to install it:

yum install libuv

2. Common error: "phpize command not found"

Solution: The phpize command is missing, you can execute the following command to install it:

yum install php-devel

3. How to determine whether the Swoole extension is installed

You can use the following command to check whether the Swoole extension is installed:

php -m | grep swoole

If "Swoole" is output Indicates that the Swoole extension has been installed.

4. How to set up Nginx when using Swoole

You can use the swoole_http_server extension provided by Swoole to start the web server and listen to the specified port, and then reverse proxy Nginx to the port. Can.

The above is a brief introduction to Swoole. Swoole is a very powerful asynchronous network communication engine that has been widely used in the field of high concurrency on the Internet. I hope this article will be helpful to you and help you further master the use of Swoole.

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