PHP 3, PHP 4, PHP 5.  ftps:// since PHP 4.3.0
- ftp://example.com/pub/file.txt 
- ftp://user:password@example.com/pub/file.txt 
- ftps://example.com/pub/file.txt 
- ftps://user:password@example.com/pub/file.txt 
   Allows read access to existing files and creation of new files
   via FTP.  If the server does not support passive mode ftp, the
   connection will fail.
  
   You can open files for either reading or writing, but not both
   simultaneously.  If the remote file already exists on the ftp
   server and you attempt to open it for writing but have not specified
   the context option overwrite, the connection
   will fail.  If you need to overwrite existing files over ftp,
   specify the overwrite option in the context 
   and open the file for writing.  Alternatively, you can
   use the FTP extension.
  
Appending: 
    As of PHP 5.0.0 files may be appended via the
    ftp:// URL wrapper.  In prior versions, attempting
    to append to a file via ftp:// will result in failure.
   
   ftps:// was introduced in PHP 4.3.0.  
   It is the same as ftp://,
   but attempts to negotiate a secure connection with the ftp server.
   If the server does not support SSL, then the connection falls back
   to regular unencrypted ftp.
  
Note: FTPS is supported starting from PHP 4.3.0, if you
    have compiled in support for OpenSSL.
   
   
Table M-4. Wrapper Summary
   
Table M-5. Context options (as of PHP 5.0.0)
| Name | Usage | Default | 
|---|
| overwrite | Allow overwriting of already existing files on remote server.
        Applies to write mode (uploading) only. | FALSE (Disabled) | 
| resume_pos | File offset at which to begin transfer.  
        Applies to read mode (downloading) only. | 0 (Beginning of File) | 
| proxy (PHP 5.1.0 or greater) | Proxy FTP request via http proxy server.
        Applies to file read operations only.
        Ex: tcp://squid.example.com:8000 |  | 
Underlying socket stream context options: 
    Additional context options may be supported by the 
    underlying transport
    For ftp:// streams, refer to context
    options for the tcp:// transport.  For
    ftps:// streams, refer to context options
    for the ssl:// transport.