Question

Expected value for the post is 0 OR 1 but when the value is zero it returns error

if(!($data['status'] = filter_input(INPUT_POST,'status',FILTER_VALIDATE_INT)))
{
  echo'Error';
}
else 
return true;

Answer 1

Your if statement is implicitly converting the result of the call to filter_input() to a boolean and then testing that result. In your case, the result is 0 which is implicitly converted to FALSE, so the test fails.

You need to explicitly test with an identity comparison against FALSE:

$data['status'] = filter_input(INPUT_POST,'status',FILTER_VALIDATE_INT);
if ($data['status'] === FALSE) ...

See PHP type comparison tables for more information.