(PECL ssh2 >= 0.9.0)
ssh2_sftp_unlink — Delete a file
ssh2_sftp_unlink ( resource $sftp , string $filename ) : bool
Deletes a file on the remote filesystem.
sftp
An SSH2 SFTP resource opened by ssh2_sftp().
filename
Returns true on success or false on failure.
Example #1 Deleting a file
<?php
$connection = ssh2_connect('shell.example.com', 22);
ssh2_auth_password($connection, 'username', 'password');
$sftp = ssh2_sftp($connection);
ssh2_sftp_unlink($sftp, '/home/username/stale_file');
?>
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https://www.php.net/manual/en/function.ssh2-sftp-unlink.php