how to convert key values of array in php - php

Question

Hi I am trying to convert the values of an array of grades of students to the alphabetical values and then I wnat to echo them. That is, I am retrieving this array
Array (
'discipline' => 5,
'practicals' => 1,
'presentations' => 2,
'assignments' => 3,
'communication_skills' => 4,
'average' => 3,
'marks' => 25,
'grade' => 'A'
)
and now want to give output as
discipline=>'D',
practicals => A
presentation => B+
assignments=> B
communication_skills => C
Is it possible to do without writing long if than else code in PHP.

Answer 1

If the source of the student is a multidimensional array, then you can loop through the students skipping the overall grade and marks from the array, changing only the subject grades.
If your not using a multidimensional array, you can simply remove the first foreach loop and then change the syntax of variable names to address a single student.
$grades = ['a+', 'a', 'b']; //change accordingly to your grade schema
$students = []; // The source of your student array goes here if it's multidimensional
foreach($students as $student){
foreach($student as $subject => $grade){
if($subject == 'grade' || $subject = 'marks'){
continue;
}
$student[$subject] = $grades[(int)$grade];
}
}

Answer 2

Create an array of grades and then use it to show grades instead of numbers:
<?php
$grades = [
1=>'A',
2=>'B+',
3=>'B',
4=>'C',
5=>'D'
];
$array = [
'discipline' => 5,
'practicals' => 1,
'presentations' => 2,
'assignments' => 3,
'communication_skills' => 4,
'average' => 3,
'marks' => 25,
'grade' => 'A'
];
foreach($array as $key=>$value){
if(!in_array($key, ['average','marks','grade'])){
$array[$key] = $grades[$value];
}
}
print_r($array);
Output: https://3v4l.org/sCWHb
Note:- Used in_array() to skip columns while assigning grades.
It's because if in case more columns needs to be ignored while assigning grades then just add them to the array used inside in_array(). That's it and it will work fine (no other code modification needed).