(PECL ssh2 >= 0.9.0)
ssh2_sftp_realpath — Resolve the realpath of a provided path string
ssh2_sftp_realpath ( resource $sftp , string $filename ) : string
Translates filename into the effective real path on the remote filesystem.
sftp
An SSH2 SFTP resource opened by ssh2_sftp().
filename
Returns the real path as a string.
Example #1 Resolving a pathname
<?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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https://www.php.net/manual/en/function.ssh2-sftp-realpath.php