函数ssh2_connect不存在

I'm trying to set a ssh call to a button using PHP.

When I tried the ssh using ssh2_connect() function , the following error occurred in my browser :

function ssh2_connect does not exist

Packages installed :

automake make php-devel libtool openssl-devel gcc++ gcc

wget http://pecl.php.net/get/ssh2-0.12.tgz

After installation I could not find the ssh2.ini file. I have only the ssh2.so file in my extensions directory.

Request :

Please help me resolve this problem, so that I can successfully ssh to my target server .

My Code :

1. example.php (setting a ssh action to a button , this redirects to index.php )

   <form action="index.php"method="get">
       <input type="hidden" name="act" value="run">
       <input type="submit" value="run">
   </form>
   

2. index.php

   <?php
   
       if (!function_exists("ssh2_connect")) die("function ssh2_connect doesnot exist");
   
        if (!($con = ssh2_connect("My server IP", 22))){
             echo "fail:unable to establish connection";
        }else{
             echo "we are logged in ";
        if (!($stream = ssh2_exec($con, "ls -al"))) {
             echo "fail:unable to exec command";
        }else{
             stream_set_blocking($stream,true);
             $data = "";
             while ($buf = fread($stream,4096)){
             $data .= $buf;
        }
        fclose($stream);
       }
   }
   ?>