Pass a function call that returns a value:
string(8) "original"
string(8) "original"
Pass a function call that returns a reference:
string(8) "original"
string(7) "changed"

Pass a static method call that returns a value:
string(8) "original"
string(8) "original"
Pass a static method call that returns a reference:
string(8) "original"
string(7) "changed"

Pass a method call that returns a value:
string(8) "original"
string(8) "original"
Pass a method call that returns a reference:
string(8) "original"
string(7) "changed"