getAttendanceData.php

<?php 

$attendanceArray = [];

$fp = fopen(request()->attendance, 'rb');
while ( ($line = fgets($fp)) !== false) {
    //echo "$line<br>";
    //$line = explode(' ', $line);
    $line = explode("\t", $line);
    array_push($attendanceArray, $line);
}
//echo '<pre>';
//print_r($attendanceArray);
//exit;
//var_dump(is_int((int)$attendanceArray[0][7]));
dd($attendanceArray);