求将数组转成逗号隔开字符串的最快方法

Question

str=""
                  for each i in 数组
                           str=str&cstr(i)&","
next

Answer 1

$arr = implode(",", $str);

Answer 2

str=""
                  for each i in 数组
                          if str="" then
                               str=cstr(i)
                          else
                               str=str&","&cstr(i)
next

Answer 3

str=""
                  for each i in 数组
                          if str="" then
                               str=cstr(i)
                          else
                               str=str&","&cstr(i)
                          end if
next

Answer 4

哈,正确答案终于出现了,这个函数还真没用过 thks!!