--TEST-- oss-fuzz #62294: Unsetting variable after ++/-- on string variable warning --FILE-- --EXPECT-- POST DEC Decrement on non-numeric string has no effect and is deprecated string(1) " " PRE DEC Decrement on non-numeric string has no effect and is deprecated string(1) " " POST INC Increment on non-alphanumeric string is deprecated string(1) " " PRE INC Increment on non-alphanumeric string is deprecated string(1) " "