_GroupList::sort_best_grade_first_by_student_grades

5.x _GroupList.php _GroupList::sort_best_grade_first_by_student_grades(Student $student)

Sorts best-grade-first, as defined by the setting "grade_order", which is a CSV of grades, best-first. Ex: A, B, C, D, F

We will use the student's best grade for a course, rather than the actual course's grade. Generally, this can be left as set to null. This is only for when we are trying to organize a list of courses into the grade order, based on what a student has taken. For example, if we want to order a Group's list of courses based on what the student has taken and the grades they made.

We will do this for each group in this group list, and the group list with the best grades overall will be sorted to the top, the group with the worst grades will sort to the bottom.

File

classes/_GroupList.php, line 437

Class

_GroupList

Code

function sort_best_grade_first_by_student_grades(Student $student) {


  $temp = csv_to_array(variable_get("grade_order", "AMID,BMID,CMID,DMID,FMID,A,B,C,D,F,W,I"));
  // We will use array_flip to get back an assoc array where the grades are the keys and the indexes are the values.
  $temp = array_flip($temp);
  // Go through the grades and convert the integers to strings, padd with zeros so that everything is at least 3 digits.
  $grades = array();
  foreach ($temp as $grade => $val) {
    $grades[$grade] = str_pad((string) $val, 3, "0", STR_PAD_LEFT);
  }

  // We now have our grades array just how we want it.  Best grade has lowest value.  Worst grade has highest value.

  $unknown_grade_value = "999"; // sort to the very end, in other words.   


  $tarray = array();
  for ($t = 0; $t < $this->count; $t++) {
    $g = $this->array_list[$t];

    $student_grade_score = $g->list_courses->sort_best_grade_first($student);
    // Now, we want to record their "grade score", which we will use for sorting.

    // Make sure all the values are uniformly 6 digits long 
    $student_grade_score = str_pad((string) $student_grade_score, 6, "0", STR_PAD_LEFT);

    $tarray[] = "$student_grade_score ~~ $t";

  }

  // Sort by those grade scores
  sort($tarray);

  // Okay, now go back through tarray and re-construct a new GroupList
  $new_list = new GroupList();
  for ($t = 0; $t < count($tarray); $t++) {
    $temp = explode(" ~~ ", $tarray[$t]);
    $i = $temp[1];
    $new_list->add($this->array_list[$i]);
  }

  // Okay, now $new_list should contain the correct values.
  // We will transfer over the reference.
  $this->array_list = $new_list->array_list;

  // And we are done!

}