Description
resource 
ssh2_sftp ( resource session )
     Request the SFTP subsystem from an already connected SSH2 server.
    
     This method returns an SSH2 SFTP resource for use with
     all other ssh2_sftp_*() methods and the
     ssh2.sftp:// fopen wrapper.
    
Example 1. Opening a file via SFTP 
<?php $connection = ssh2_connect('shell.example.com', 22); ssh2_auth_password($connection, 'username', 'password');
  $sftp = ssh2_sftp($connection);
  $stream = fopen("ssh2.sftp://$sftp/path/to/file", 'r'); ?>
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     See Also:
     ssh2_scp_send(), and
     ssh2_scp_recv()