Error message

Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home/virtwww/w_code-sampc3e_56a7b680/http/includes/common.inc).

"continue" statement in Swift

let numbers = [ 235711131719 ]
var str = ""
for var i = 0; i < numbers.count; i++ {
    if i % 2 == 1 {
        continue
    }
    str += (str == "" ? "" : "-") + "\(numbers[i])"
}
//str is "2-5-11-17"