Solution to PHP Fatal error: Call to undefined function ssh2_sftp()

For developers who use PHP for SSH connections, it may be very common to encounter the error "PHP Fatal error: Call to undefined function ssh2_sftp()". This error is usually caused by a missing extension, and this article will show you how to fix it.

First, we need to check whether the SSH2 extension has been installed on the server. Run the following command in the terminal to check whether it is installed:

php -m | grep ssh2

If the returned result is empty, it means that the SSH2 extension is not installed. We need to install it by following the steps:

1. Install Libssh2

Libssh2 is a client library based on the SSH2 protocol for connecting to the SSH server. We need to download the Libssh2 library from the official website. The latest Libssh2 source code can be found at the following link:

https://www.libssh2.org/download/libssh2-1.9.0.tar.gz

After the download is complete, unzip Zip the file and go to the unzipped folder, run the following command in the terminal to install Libssh2:

./configure make sudo make install

2. Install PECL SSH2 extension

PECL is the PHP extension library center , which provides source code for many PHP extensions. If we want to use PECL to install the SSH2 extension, we need to run the following command in the terminal:

sudo pecl install ssh2

During the installation process, you may be prompted to fill in the path to the php.ini configuration file. You can use the following command to find the path to the php.ini file:

php -i | grep php.ini

After installation, you need to add the following configuration information to the php.ini file:

extension=ssh2.so

3. Restart PHP- FPM or Apache server

After completing the above two steps, we need to restart the PHP-FPM or Apache server. Run the following command in the terminal to restart PHP-FPM:

sudo service php-fpm restart

If you are using an Apache server, you can use the following command to restart:

sudo service apache2 restart

4. Check if the SSH2 extension is installed

We can check again whether the SSH2 extension is installed. Run the following command in the terminal:

php -m | grep ssh2

If the word "ssh2" is returned, it proves that the SSH2 extension has been successfully installed.

If the problem still cannot be solved after the above steps, you can try to install other dependent libraries or upgrade the PHP version.

In short, solving the "PHP Fatal error: Call to undefined function ssh2_sftp()" error requires us to carefully troubleshoot the problem and follow the above steps to check one by one. Happy problem solving everyone!

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