时间格式化我使用了Carbon类包

function getHoliday($date_time)
    {
       $date_time = \Carbon\Carbon::parse($date_time);
        $curl  =  curl_init ( ) ;
        $params = [
            'query'      => str_replace('年0', '年', $date_time->format('Y年m月')),
            'resource_id'=> 39043,
            'tn'         => 'wisetpl',
            'ie'         => 'utf8',
            'oe'         => 'utf8',
            'format'     => 'json',
        ];
        //设置抓取的url
        curl_setopt ( $curl , CURLOPT_URL ,  'https://sp0.baidu.com/8aQDcjqpAAV3otqbppnN2DJv/api.php?'.http_build_query($params) ) ;
        //设置头文件的信息作为数据流输出
        curl_setopt ( $curl , CURLOPT_HEADER ,  0 ) ;
        curl_setopt($curl, CURLOPT_TIMEOUT, 3);
        //设置获取的信息以文件流的形式返回，而不是直接输出。
        curl_setopt ( $curl , CURLOPT_RETURNTRANSFER ,  1 ) ;
        //执行命令
        $data  =  curl_exec ( $curl ) ;
        //关闭URL请求
        curl_close ( $curl ) ;
        //显示获得的数据
        $holiday_info = json_decode($data,true);
        $holiday_info['data'][0]['almanac'] = $holiday_info['data'][0]['almanac'] ?? [];
        $array = [];
        foreach ($holiday_info['data'][0]['almanac'] as $value) {
            $status = $value['status'] ?? 0;
            //$status 1假节日 2周末补班 0正常时间（可按照周六周日来划分是否是节假日）
            $date = \Carbon\Carbon::parse($value['oDate'])->setTimezone('Asia/Shanghai');
            $is_weekend = $date->isWeekend();
            $de_time = $date->format('Y-m-d');
            if (1 == $status || ($is_weekend && 0 == $status)) {
                //假日
                $array[$date->format('Y-m')][] = $de_time;
            }
        }
        if ($array) {
            $array = $array[$date_time->format('Y-m')] ?? [];
        }
        return $array;
    }
    return getHoliday("2021-07");

[
    "2021-07-03",
    "2021-07-04",
    "2021-07-10",
    "2021-07-11",
    "2021-07-17",
    "2021-07-18",
    "2021-07-24",
    "2021-07-25",
    "2021-07-31"
]