stream_get_line (PHP)

I'm having a play with reading a txt file line by line. I've looked at the fgets() function and now I'm looking at the stream_get_line() function but I'm a bit confused.

My txt file looks like:

The Name;
This is the description;

I have some code that looks like:

<?php
//Script to read details of a file
$myFile = "file/file.txt";
$fh = fopen($myFile, 'r');
$theData = stream_get_line($fh,4096,";");
fclose($fh);
echo $theData;
?>

This will return the first line of the txt file no problem.

What if I now want to get the second line of data?