wmde/WikibaseQuery — pull request #28 by thiemowmde (2014-06-05 22:27:06+00:00)
Title: Really pass by reference

PHP is pretty clever. If you omit the two `&` this doesn't necessarily mean the array is copied. If it's not touched and only read it will stay a reference and never be copied.

If you want to change the original array you need both `&`.

If you omit one `&` the array will be copied. Always. No matter if it's touched or not.