Code completion result for source line:
testNullableTy|pe(2, null, null);
(QueryType=COMPLETION, prefixSearch=false, caseSensitive=true)
METHOD     testNullableType(?int $param1,  [PUBLIC]   functionWithoutPhpDoc.php

Documentation:

testNullableType


Parameters:

 ?int$param1PHPDoc not found
 ?Foo$param2PHPDoc not found
 ?\Test\Bar$param3PHPDoc not found

Returns:

Type:?\Test\Foo