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To install the php ssh2 extension on RHEL8 running php 7.4, follow the steps below:

1. Install the dependencies required for compiling the ssh2 extension:

   sudo dnf -y install gcc php-devel php-pear libssh2-devel
   

2. Install the ssh2 extension via the pecl command:

   sudo pecl install ssh2-1.3.1
   

3. Once the ssh2 extension is installed successfully, add the extension to the php.ini file:

   sudo echo "extension=ssh2.so" >> /etc/php.ini
   

4. Verify that the ssh2 extension is loaded by running the following command:

   php -m | grep ssh2
   

   If the extension is correctly loaded, it will output "ssh2". If you encounter any issues, restart your web server:

   sudo systemctl restart httpd
   

And that's it! You have successfully installed the php ssh2 extension on RHEL8.