take_grades.php

<?php

// Read the php input and save it to a file.
$fname = sprintf('takegrades_output/output_%s.txt',uniqid()); 
print $fname;
file_put_contents($fname,file_get_contents('php://input'));

/*
 * Read the input sent via the script, parse it as CSV and save it in 
 * $grade_data_received which is an associative array
 */

$grade_data_received = array();
if (($handle = fopen($fname, "r")) !== FALSE) {
  $header_keys = array();
  $header_keys = fgetcsv($handle,0,",");
  while (($data = fgetcsv($handle, 0, ",")) !== FALSE) {
    $grade_data_received[] = array_combine($header_keys,array_pad($data,count($header_keys),"-"));
  }
}

print_r($grade_data_received);