(PECL ssh2:0.10-0.9)
ssh2_sftp_unlink — Delete a file
Deletes a file on the remote filesystem.
如果成功则返回 TRUE，失败则返回 FALSE。
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');
?>