How to add dio extension in php

In the process of using PHP for development, you may encounter situations where you need to use the dio extension. The dio extension can operate devices such as serial ports and parallel ports, and can also read and write files, which greatly enhances the functionality and flexibility of PHP. However, the dio extension is not installed by default in PHP and needs to be added manually.

This article will introduce in detail how to add dio extension in PHP so that PHP can better operate various devices and files.

1. Install dio extension

1.1 Install dependencies

Before installing the dio extension, you need to install some necessary dependencies. The command is as follows:

sudo apt-get install php-dev

sudo apt-get install php-pear

sudo apt-get install libpcre3-dev

1.2 Download dio extension

After installing the dependencies, you need to download the source code of the dio extension. You can download it through the following command:

sudo pecl channel-update pecl.php.net

sudo pecl install dio

After the download is completed, you can go to the PHP extension directory Find the file with dio extension, the file name is "dio.so".

2. Enable dio extension

2.1 Find the PHP configuration file

Before using it, you need to enable dio extension. First, you need to find the PHP configuration file. "php.ini" is the main configuration file of PHP, so you can find the file path through the following command:

php -i | grep "Loaded Configuration File"

2.2 Modify the PHP configuration file

After finding the "php.ini" file, add the following code in it:

extension=dio.so

After adding the code, save the configuration file and restart php-fpm Serve.

3. Test the dio extension

After enabling the dio extension, you can use the following sample code to test whether it works properly:

$port = dio_open('/dev/ttyUSB0', O_RDWR);

if (!$port) {

die('Unable to open port');

}

echo dio_read($port, 20);

dio_close($port);
?>

The above code opens a serial port device, reads 20 bytes of data from it and displays it. You can replace the path of the serial port device and the read data length for testing.

If the test result is normal, it means that the dio extension has been successfully installed and enabled and can be used.

4. Notes

When using the dio extension, you need to pay attention to the following points:

1. The dio extension needs to run on a Linux or Unix system, so in Not available on Windows systems.
2. When using the dio extension, you need to run it with root or sudo privileges.
3. Be especially careful when using dio extensions in PHP code to avoid security issues.

Conclusion

This article introduces the method of adding dio extension in PHP. It explains each step in detail by installing dependencies, downloading source code, enabling extension and testing code. operate. dio extensions can enhance the functionality and flexibility of PHP, but they also need to be used with care to avoid security issues. I hope this article can be helpful to PHP developers who need to add dio extensions.

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