Question

Given the below variables:

$field1;
$field2;
$field3;
$field4;
$field5;

How can I use logical operators so that the user has to fill in either field: 1,2,3 OR either field 1, 2, 4, 5. If user does not do one of the following, then I want to give error required fields not complete.

I have tried:

if ((!$field1 | !$field2 |!$field3) | (!$field1 | !$field2 |!$field4|!$field5)) 
    $errors[] = 'You did not complete all of the required fields.';

Answer 1

if (!
  // Exactly 1,2,3 are filled in (not 4, 5)
  (!empty($field1) && !empty($field2) && !empty($field3) && empty($field4) && empty($field5))
  // or Exactly 1,2,4,5 are filled in (not 3)
  && !(!empty($field1) && !empty($field2) && !empty($field4) && !empty($field5) && empty($field3))
) {
   // print error
}