字符串拆分，当遇到区间时遍历区间内的所有值

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public function explodes($str){

    $return = [];

    $array = [];

    foreach(explode(",",$str) as $k => $v){

        $return = array_merge($return,(strpos($v,'-') && $array = explode('-',$v))?range($array[0],$array[1]):[$k=>intval($v)]);

    }

    return $return;

}