Problem getting last chunk in a while loop - php

Question

So it's been awhile since i did any PHP and to be honest, this question feels kinda dumb. But my head is just stuck thinking about how to get last chunk in a file.
My while loop reads a file, line by line and after 10 lines it should execute a code. Problem occures when there's 51 lines. How do i reach the last line?
The file is over 300 mb so I cannot load it into memory (array).
while ($row = fgets($handle))
{
$chunk[] = array_combine($feed_product_arraykeys, explode("\t", $row));
if(count($chunk) == 10)
{
echo count($chunk) . '<br>';
// Initiate code
unset($chunk);
}
}
Best Regards

Answer 1

Here's an alternate way. Just read the file into an array and chunk it into chunks of 10 The remaining will be in the last chunk:
foreach(array_chunk(file('/path/to/file'), 10) as $row) {
$chunk[] = array_combine($feed_product_arraykeys, explode("\t", $row));
echo count($chunk) . '<br>';
}

Answer 2

So i actually fixed it by counting number of rows in the file. I thought it would be slow but its actually fast, even on a 300 mb file with 130k rows.
// Count number of lines in feed
$feed_row_count = count_lines_in_file("tmp/56.csv");
$row_counter = 0;
$feed_handle = fopen("tmp/56.csv", "r");
while ($row = fgets($feed_handle))
{
$row_counter++;
$chunk[] = array_combine($feed_product_arraykeys, explode("\t", $row));
if(count($chunk) == 25 || $feed_row_count == $row_counter)
{
echo count($chunk) . '<br>';
// Initiate SQL
unset($chunk);
}
}