string(1) "a"
string(1) "a"
string(1) "a"
string(6) "     a"
NULL
string(0) ""
string(1) "a"
string(1) "a"
Error: [] operator not supported for strings
string(0) ""
Error: Cannot use assign-op operators with string offsets
string(0) ""
Error: Cannot use string offset as an array
string(0) ""