PHP getservbyport() Function: Everything You Need to Know

As a PHP developer, you may need to obtain the service name associated with a given port number. In such scenarios, the PHP getservbyport() function comes in handy. It is a built-in function in PHP that allows you to retrieve the service name associated with a given port number. In this article, we will take an in-depth look at the getservbyport() function and its usage.

What is the getservbyport() Function?

The getservbyport() function is a PHP built-in function that allows you to retrieve the service name associated with a given port number.

How to Use the getservbyport() Function

Using the getservbyport() function is straightforward. Here is the syntax of the function:

getservbyport($port, $protocol);

The function takes two parameters:

• $port: The port number for which you want to retrieve the service name.
• $protocol: The protocol for which you want to retrieve the service name. This parameter is optional and defaults to TCP if not specified.

Here is an example of how to use the getservbyport() function to retrieve the service name associated with a port number:

<?php

$port_number = 80;
$protocol_name = "tcp";
$service_name = getservbyport($port_number, $protocol_name);
if ($service_name === false) {
  echo "Failed to retrieve service name for port number $port_number and protocol name $protocol_name";
} else {
  echo "The service name for port number $port_number and protocol name $protocol_name is $service_name";
}

In this example, we retrieve the service name associated with the port number 80 using the getservbyport() function or outputting an error message indicating that it failed to retrieve the service name for the given port number and protocol name.

Conclusion

The getservbyport() function is a useful tool for retrieving the service name associated with a given port number. By understanding the syntax and usage of the function, you can easily obtain the service name that you need for your PHP application. We hope this article has been informative and useful in understanding the getservbyport() function in PHP.