string(21) "222222222224444444443"
string(2) "cc"
array(3) {
  ["a"] => string(2) "aa"
  ["b"] => string(2) "bb"
  ["c"] => string(2) "cc"
}

:)

ThinkPHP V5.1
12载初心不改(2006-2018) - 你值得信赖的PHP框架