Sass version of PHP explode

Sass version of PHP explode

//
// Returns list after splitting a string by a delimiter string.
// Similar to PHP's explode function
//
@function explode($string, $delimiter: "", $separator: "space")
  @if type-of($string) != "string"
    @warn "`explode` function expecting a string; #{type-of($string)} given."
    @return null
  @if type-of($delimiter) != "string"
    @warn "`explode` function expecting a string; #{type-of($delimiter)} given."
    @return null
  $result: ()
  $length: str-length($string)
  @if not index("space" "comma", $separator)
    $separator: "space"
  @if str-length($delimiter) == 0
    @for $i from 1 through $length
      $result: append($result, str-slice($string, $i, $i))
    @return $result
  $running: true
  $remaining: $string
  @while $running
    $index: str-index($remaining, $delimiter)
    @if not $index
      $running: false
    @else
      $slice: str-slice($remaining, 1, $index - 1)
      $result: append($result, $slice, $separator)
      $remaining: str-slice($remaining, $index + str-length($delimiter))
  @return append($result, $remaining, $separator)