PhpFunctionUtil.getReturnType(): advanced analysis

[rentalhost]

Additional analysis (should check if all is applicable):

• Compound types: array, object, callable (and iterable?);
• Resource type: resource;
• Callable type: callable;
• Void type: void;
  • From return;;
  • From no return statement;
• Make sure to ignores unreacheable return statements;
  • After the last return (eg. return; return $unreacheable;);
  • After an uncatched throw;
• Support to complex array types:
  • Return int[] from one type array (eg. [1, 2, 3]);
  • Return mixed[] from mixed type array (eg. [1, 'a', true]);
• Make sure that comparison returns bool (eg. return $a === $b);
• Make sure that expressions returns int (eg. return $a + $b);
• Make sure that concats returns string (eg. return $a . $b);