abaikan saja

<?php
//males mode on

$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($inputFileName);


        $huruf = array(
            'b',
            'c',
            'd'
        ); //maaf lagi males
        $max   = 20;
        $n20   = 0;
        $res   = array();
        foreach ($huruf as $n) {
            for ($i = 1; $i <= $max; $i++) {
                $cell = strtoupper($n . $i);
                $col  = $spreadsheet->getActiveSheet()->getStyle($cell)->getFont()->getColor()->getRGB();
                $txt  = $spreadsheet->getActiveSheet()->getCell($cell)->getValue();
                if ($col == 'FF3333') {
                    if (!isset($res[$txt]))
                        $res[$txt] = 0;
                    $res[$txt]++;
                }
                //FF3333
            }
        }

print_r($res);