In-Depth Guide to PHP ftp_get_option() Function with Practical Examples

1. Introduction

In PHP, the ftp_get_option() function is used to retrieve configuration option values from an FTP connection. This article will delve into the function’s capabilities and usage, helping developers better understand and utilize FTP-related operations.

2. Basic Usage of ftp_get_option() Function

The ftp_get_option() function retrieves the value of a specified option for a given FTP connection. Its basic syntax is:

<span class="fun">mixed ftp_get_option(resource $ftp_stream, int $option)</span>

Parameter explanation:

• $ftp_stream: An FTP connection resource established via ftp_connect().
• $option: The FTP option to retrieve, passed as a predefined FTP constant.

2.1 Common Option Constants

The following are common option constants supported by ftp_get_option():

• FTP_TIMEOUT: The timeout duration (in seconds) for the current FTP session.
• FTP_AUTOSEEK: Indicates whether auto-seek mode is enabled.
• FTP_USEPASVADDRESS: Indicates whether the transformed PASV mode IP address is used.
• FTP_FILETYPE: The file type used by the FTP transfer channel.
• FTP_RESPONSE_TIMEOUT: Timeout for reading the FTP response.

2.2 Return Values

The function returns the value corresponding to the specified option. The type depends on the option and can be an integer, boolean, etc.

3. Example

The following example demonstrates how to use ftp_get_option() to retrieve the timeout of an FTP connection:

// Create FTP connection
$ftp = ftp_connect("ftp.example.com");
// Log in to FTP server
ftp_login($ftp, "username", "password");
// Get the FTP connection timeout
$timeout = ftp_get_option($ftp, FTP_TIMEOUT);
echo "FTP connection timeout is: " . $timeout;

Sample output:

FTP connection timeout is: 90

4. Conclusion

The ftp_get_option() function is an essential PHP tool to retrieve configuration options for FTP connections. Mastering its use can help developers efficiently manage and stabilize FTP operations.