(PECL ssh2 >= 0.9.0)
ssh2_sftp_rename — Rename a remote file
ssh2_sftp_rename ( resource $sftp , string $from , string $to ) : bool
Renames a file on the remote filesystem.
sftp
An SSH2 SFTP resource opened by ssh2_sftp().
from
The current file that is being renamed.
to
 The new file name that replaces from. 
 Returns true on success or false on failure. 
Example #1 Renaming a file via sftp
<?php
$connection = ssh2_connect('shell.example.com', 22);
ssh2_auth_password($connection, 'username', 'password');
$sftp = ssh2_sftp($connection);
ssh2_sftp_rename($sftp, '/home/username/oldname', '/home/username/newname');
?> 
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    https://www.php.net/manual/en/function.ssh2-sftp-rename.php