This rule applies whenever an if statement is followed by one or more else if statements; the final else if
should be followed by an else statement.
The requirement for a final else statement is defensive programming.
The else statement should either take appropriate action or contain a suitable comment as to why no action is taken. This is
consistent with the requirement to have a final default clause in a switch statement.
Noncompliant code example
if (condition1) {
do_something();
} elseif (condition2) {
do_something_else();
}
Compliant solution
if (condition1) {
do_something();
} elseif (condition2) {
do_something_else();
} else {
throw new InvalidArgumentException('message');
}
Exceptions
When all branches of an if-elseif end with return, break, continue or throw, the
code that comes after the if implicitly behaves as if it was in an else clause. This rule will therefore ignore that
case.
