<?php
$connection = ssh2_connect('shell.example.com', 22);
ssh2_auth_password($connection, 'username', 'password');
$sftp = ssh2_sftp($connection);
$realpath = ssh2_sftp_realpath($sftp, '/home/username/../../../..//./usr/../etc/passwd');
/* $realpath is now: '/etc/passwd' */
?>
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