PHP 3, PHP 4. ftps:// since PHP 4.3.0
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 I-3. Wrapper Summary
|Restricted by allow_url_fopen.||Yes|
|Allows Writing||Yes (Prior to PHP 5.0.0: new files only. PHP 5.0.0 and later: overwrite allowed with context option)|
|Allows Appending||Yes (PHP 5.0.0 or later)|
|Allows Simultaneous Reading and Writing||No|
|Supports unlink()||Yes (PHP 5.0.0 or later)|
Table I-4. Context options (as of PHP 5.0.0)
|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)|
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.