Mute Duck

Compare two .csv files of different sizes

$file1 = readCSV($current_csv);
$file2 = readCSV($previous_csv);

$differences = [];

$maxLines = max(count($file1), count($file2));
for ($i = 0; $i < $maxLines; $i++) {
    if ($i < count($file1) && $i < count($file2)) {
        if ($file1[$i] !== $file2[$i]) {
            $differences[] = [
                'line_number' => $i + 1,
                'file1' => $file1[$i],
                'file2' => $file2[$i]
            ];

            // write out here

        }
    } elseif ($i < count($file1)) {
        $differences[] = [
            'line_number' => $i + 1,
            'file1' => $file1[$i],
            'file2' => null
        ];

        // write out here

    } elseif ($i < count($file2)) {
        $differences[] = [
            'line_number' => $i + 1,
            'file1' => null,
            'file2' => $file2[$i]
        ];

        // write out here
    }
}