How can PHP be instructed to skip empty lines when writing to a file, and why is this important in maintaining data integrity?

To skip empty lines when writing to a file in PHP, you can check if the line is empty before writing it to the file. This is important in maintaining data integrity because empty lines can introduce unnecessary clutter and potentially lead to errors when reading or processing the data.

$file = fopen("data.txt", "w");

$data = "Some data\n\nAnother line\n";

$lines = explode("\n", $data);

foreach ($lines as $line) {
    if (!empty($line)) {
        fwrite($file, $line . "\n");
    }
}

fclose($file);