Helper for drupal_rewrite_settings().
Checks whether this token represents a valid array index: a number or a stirng.
int $type: The token type @see token_name().
bool TRUE if this token represents a number or a string.
function _drupal_rewrite_settings_is_array_index($type) {
$is_integer = $type == T_LNUMBER;
$is_float = $type == T_DNUMBER;
$is_string = $type == T_CONSTANT_ENCAPSED_STRING;
return $is_integer || $is_float || $is_string;
}