Ftp_get_option()

What is ftp_get_option()?

The ftp_get_option() function is a PHP built-in function that retrieves various runtime options of the specified FTP connection. The function takes two parameters:

1. ftp_stream: The connection identifier returned by the ftp_connect() function.
2. option: The name of the option to retrieve.

The function returns the value of the option. If the option doesn't exist or the connection identifier is invalid, the function returns false.

Syntax of ftp_get_option()

The syntax of the ftp_get_option() function is as follows:

mixed ftp_get_option ( resource $ftp_stream , int $option )

The ftp_get_option() function takes two parameters: ftp_stream and option. The ftp_stream parameter is the connection identifier returned by the ftp_connect() function. The option parameter is an integer that represents the option to retrieve.

Available options in ftp_get_option()

The following is a list of available options in the ftp_get_option() function:

• FTP_TIMEOUT_SEC: The timeout in seconds for all network-related functions.
• FTP_AUTOSEEK: Automatically seek to the start of the remote file on each read operation.
• FTP_USEPASVADDRESS: Use the IP address returned in the PASV response to establish a secondary connection for data transfer.
• FTP_FILETYPE: The transfer mode. This option can be set to FTP_ASCII or FTP_BINARY.
• FTP_LISTEN: Wait for a connection instead of initiating one on the secondary connection for data transfer.
• FTP_IGNORE_PASSIVE_ADDR: Ignore the IP address returned in the PASV response and use the address of the FTP server instead.

Usage of ftp_get_option()

To use the ftp_get_option() function, you first need to establish a connection to the FTP server using the ftp_connect() function. Here's an example:

<?php

// Set up an FTP connection
$conn = ftp_connect('ftp.example.com');

// Login with your FTP credentials
ftp_login($conn, 'username', 'password');

// Retrieve the value of the FTP_TIMEOUT_SEC option
$timeout = ftp_get_option($conn, FTP_TIMEOUT_SEC);

// Close the FTP connection
ftp_close($conn);

In this example, we establish a connection to the FTP server using the ftp_connect() function. Then we log in using our FTP credentials using the ftp_login() function. Finally, we retrieve the value of the FTP_TIMEOUT_SEC option using the ftp_get_option() function and close the FTP connection.

Error handling in ftp_get_option()

It's important to handle errors properly when using the ftp_get_option() function. If the function returns false, it means that the option couldn't be retrieved for some reason. Here's an example of how to handle errors:

<?php

$option = ftp_get_option($conn, FTP_TIMEOUT_SEC);

if ($option === false) {
    echo "Failed to retrieve the option.\n";
} else {
    echo "The value of the option is $option.\n";
}

In this example, we check the return value of the ftp_get_option() function. If it's false, we display an error message; otherwise, we display the value of the option.

Conclusion

The ftp_get_option() function is a useful PHP built-in function that allows you to retrieve various runtime options of the specified FTP connection.