'' (no limit) => [] '' (limit 1) => [] '' (limit 2) => [] 'a' (no limit) => ['a'] 'a' (limit 1) => ['a'] 'a' (limit 2) => ['a'] '=' (no limit) => [] '=' (limit 1) => ['='] '=' (limit 2) => ['',''] 'a=' (no limit) => ['a'] 'a=' (limit 1) => ['a='] 'a=' (limit 2) => ['a',''] 'a=b' (no limit) => ['a','b'] 'a=b' (limit 1) => ['a=b'] 'a=b' (limit 2) => ['a','b']