Using isDirty in Laravel - laravel

Question

I'm using the isDirty() method in my controller to check if any field is changed. Then I am saving the old data of a field and the new data in a table. The code is working fine; however, how can I optimize this code?
By using the below code, I will have to write each field name again and again. If request->all() has 20 fields, but I want to check six fields if they are modified, how can I pass only 6 fields in the below code, without repeating?
Controller
if ($teacher->isDirty('field1')) {
$new_data = $teacher->field1;
$old_data = $teacher->getOriginal('field1');
DB::table('teacher_logs')->insert(
[
'user_id' => $user->id,
'teacher_id' => $teacher->id,
'old_value' => $old_data,
'new_value' => $new_data,
'column_changed' => "First Name",
]);
}

Answer 1

You can set a list of what fields you want to be checking for then you can loop through the dirty fields and build your insert records.
use Illuminate\Support\Arr;
...
$fields = [
'field1' => 'First Name',
'field2' => '...',
...
];
$dirtied = Arr::only($teacher->getDirty(), array_keys($fields));
$inserts = [];
foreach ($dirtied as $key => $value) {
$inserts[] = [
'user_id' => $user->id,
'teacher_id' => $teacher->id,
'old_value' => $teacher->getOriginal($key),
'new_value' => $value,
'column_changed' => $fields[$key];
];
}
DB::table(...)->insert($inserts);

Answer 2

i tried following code after getting idea by lagbox in comments, and i have found solution to my problem.
$dirty = $teacher->getDirty('field1','field2','field3');
foreach ($dirty as $field => $newdata)
{
$olddata = $teacher->getOriginal($field);
if ($olddata != $newdata)
{
DB::table('teacher_logs')->insert(
['user_id' => $user->id,
'teacher_id' => $teacher->id,
'old_value' => $olddata,
'new_value' => $newdata,
'column_changed' => "changed",
]);
}
}