(PHP 4 >= 4.3.0, PHP 5, PHP 7)
ftp_ssl_connect — Opens an Secure SSL-FTP connection
$host
   [, int $port = 21
   [, int $timeout = 90
  ]] )
   ftp_ssl_connect() opens an explicit SSL-FTP connection to the
   specified host. That implies that
   ftp_ssl_connect() will succeed even if the server is not
   configured for SSL-FTP, or its certificate is invalid. Only when
   ftp_login() is called, the client will send the
   appropriate AUTH FTP command, so ftp_login() will fail in
   the mentioned cases.
  
Note: Why this function may not exist
ftp_ssl_connect() is only available if both the ftp module and the OpenSSL support is built statically into php, this means that on Windows this function will be undefined in the official PHP builds. To make this function available on Windows you must compile your own PHP binaries.
Note:
ftp_ssl_connect() is not intended for use with sFTP. To use sFTP with PHP, please see ssh2_sftp().
hostThe FTP server address. This parameter shouldn't have any trailing slashes and shouldn't be prefixed with ftp://.
portThis parameter specifies an alternate port to connect to. If it is omitted or set to zero, then the default FTP port, 21, will be used.
timeoutThis parameter specifies the timeout for all subsequent network operations. If omitted, the default value is 90 seconds. The timeout can be changed and queried at any time with ftp_set_option() and ftp_get_option().
   Returns a SSL-FTP stream on success or FALSE on error.
  
| Version | Description | 
|---|---|
| 5.2.2 | The function was changed to return FALSEwhen it can't use an SSL
        connection, instead of fallbacking to a non-SSL one as previously. | 
Example #1 ftp_ssl_connect() example
<?php
// set up basic ssl connection
$conn_id = ftp_ssl_connect($ftp_server);
// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
if (!$login_result) {
    // PHP will already have raised an E_WARNING level message in this case
    die("can't login");
}
echo ftp_pwd($conn_id); // /
// close the ssl connection
ftp_close($conn_id);
?>