Laravel: preg_replace(): Parameter mismatch, pattern is a string while replacement is an array

Question

I want to save my results in the database but im getting an error exception.

In my view I have a radio button(array) that gets the result of each student which is

Answer 1

I had a similar error, where using

$attendance->fill(array with non-existing columns);

sets a non-existing column value, so on calling

$attendance->save();

afterwards, it will throw that error