PHP Fatal error: Uncaught Error: Call to undefined function ssh2 solution ()

Recently, when using PHP for SSH connection, some developers will encounter the following error message:

PHP Fatal error: Uncaught Error: Call to undefined function ssh2_connect()

or

PHP Fatal error: Uncaught Error: Call to undefined function ssh2_shell()

The main reason for this error is that PHP is missing the ssh2 extension library. This article will explain how to solve this problem.

1. Open the PHP ssh2 extension library

First, find the php_ssh2.dll file in the ext folder under the PHP installation directory, and then configure it in php.ini:

extension=php_ssh2.dll

Then restart the Apache server. If there is the ssh2 module after executing the php -m command, it means that the ssh2 extension library has been successfully opened.

2. Use PECL to install the ssh2 extension library

If your PHP version is less than 5.3.0 and the ssh2 extension library is not provided, you need to use PECL to install it.

First, use the following command to install libssh2:

yum install libssh2 libssh2-devel

Then, use PECL to install the ssh2 extension library:

pecl install ssh2 -1.0

Finally, add the following configuration information in php.ini:

extension=ssh2.so

Then restart the Apache server.

3. ssh2 extension library configuration file

In addition, the ssh2 extension library needs to configure the path of ssh2, which needs to be added in /etc/php.d/ssh2.ini The following configuration information:

extension=ssh2.so
ssh2.config=/usr/local/lib

Generally, you need to modify the path in ssh2.config according to the actual situation .

4. Check the installation of libssh2

It seems that in Linux, it is very common that the ssh2 library cannot be recognized. If you still have problems, you need to check if the libssh2 package is installed. You can also use the following command to install the libssh2 software package:

yum install libssh2

Finally, we recommend that you add the following debugging information to your PHP program to find SSH connection problems during debugging ：

error_reporting(E_ALL); //Output all error messages
ini_set('display_errors', 'on'); //Turn on error display

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