phpheaderContent-Typeapplicationjson; 获取参数并设置默认值ac=list&t=&pg=&h=&ids=&wd=$ac = isset$_GETac $_GETac list;$t = isset$_GETt $_GETt 1;类型$pg = isset$_GETpg $_GETpg 1;$h = isset$_GETh $_GETh null;

以下是优化后的代码：

<?php
header('Content-Type:application/json');

// 获取参数并设置默认值?ac=list&t=&pg=&h=&ids=&wd=
$ac = isset($_GET['ac']) ? $_GET['ac'] : 'list';
$t = isset($_GET['t']) ? $_GET['t'] : '1';//类型
$pg = isset($_GET['pg']) ? $_GET['pg'] : '1';
$h = isset($_GET['h']) ? $_GET['h'] : null;//几小时内的数据
$ids = isset($_GET['ids']) ? $_GET['ids'] : null;//视频id
$wd = isset($_GET['wd']) ? $_GET['wd'] : null;//搜索关键词

function vpost($url, $data) {
    $curl = curl_init();
    curl_setopt_array($curl, [
        CURLOPT_URL => $url,
        CURLOPT_SSL_VERIFYPEER => 0,
        CURLOPT_SSL_VERIFYHOST => 1,
        CURLOPT_USERAGENT => $_SERVER['HTTP_USER_AGENT'],
        CURLOPT_FOLLOWLOCATION => 1,
        CURLOPT_AUTOREFERER => 1,
        CURLOPT_POST => 1,
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_HEADER => 0,
        CURLOPT_RETURNTRANSFER => 1
    ]);
    $tmpInfo = curl_exec($curl);
    if (curl_errno($curl)) {
        echo 'Errno' . curl_error($curl);
    }
    curl_close($curl);
    return $tmpInfo;
}

$limit='20';
if ($ids == null) {
    $url = "https://api123.adys.app/xgapp.php/v3/video";
    $data = "tid=" . $t . "&class=&area=&lang=&year=&limit=" . $limit . "&pg=" . $pg;
    $result = vpost($url, $data);
    $data = json_decode($result, true);
    if ($h != null) {
        $total = $h * 4;
    } else {
        $total = $data['total'];
    }
    $data['total'] = $total;
    $data['limit'] = $limit;
    $data['pagecount'] = ceil($total / $limit);

    $newDataArray = [
        ["type_id" => 1, "type_pid" => 0, "type_name" => "电影"],
        ["type_id" => 2, "type_pid" => 0, "type_name" => "剧集"],
        ["type_id" => 3, "type_pid" => 0, "type_name" => "综艺"],
        ["type_id" => 4, "type_pid" => 0, "type_name" => "动漫"],
        ["type_id" => 20, "type_pid" => 0, "type_name" => "韩国电影"],
        ["type_id" => 24, "type_pid" => 0, "type_name" => "纪录片"]
    ];

    $data['class'] = $newDataArray;

    foreach ($data['data'] as &$item) {
        $item['type_id'] = $t;
        unset($item['type_id_1']);
        $item['vod_time'] = $item['vod_time_add'];
        unset($item['vod_time_add']);

        $typeId = $item['type_id'];
        foreach ($newDataArray as $typeName) {
            $item['type_name'] = '未知类型';
            if ($typeName['type_id'] == $typeId) {
                $item['type_name'] = $typeName['type_name'];
                break;
            }
        }

        sleep(1);
        $url = "https://api123.adys.app/xgapp.php/v3/video_detail";
        $data = "id=" . $item['vod_id'];
        $detailJson = vpost($url, $data);
        $detailData = json_decode($detailJson, true);
        $item = $detailData['data']['vod_info'];
    }
} else {
    $idArray = explode(',', $ids);
    $resultArray = array();

    foreach ($idArray as $id) {
        $url = "https://api123.adys.app:443/xgapp.php/v3/video_detail";
        $data = "id=" . urlencode($id);
        $response = vpost($url, $data);
        $data = json_decode($response, true);
        $data['data'] = $data['data']['vod_info'];

        $data['data']['vod_content'] = '<p>视频详情</p>';
        $vod_blurb = $data['data']['vod_blurb'];
        $data['data']['vod_content'] = '<p>' . $vod_blurb . '</p>';

        $itemData = isset($data['data']) ? $data['data'] : array();
        $resultArray[] = $itemData;
    }

    $total = count($resultArray);
    $limit = '20';
    $pageCount = ceil($total / $limit);

    foreach ($resultArray as &$item) {
        $typeId = $item['type_id'];

        $typeName = '未知类型';

        switch ($typeId) {
            case 1:
                $typeName = '电影';
                break;
            case 2:
                $typeName = '剧集';
                break;
            case 3:
                $typeName = '综艺';
                break;
            case 4:
                $typeName = '动漫';
                break;
            case 20:
                $typeName = '韩国电影';
                break;
            case 24:
                $typeName = '纪录片';
                break;
        }
    }

    $data = array(
        "code" => 1,
        "msg" => "数据列表",
        "page" => $pg,
        "pagecount" => $pageCount,
        "limit" => $limit,
        "total" => $total,
        "list" => $resultArray
    );
}

$newJson = json_encode($data, JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
echo $newJson;
?>

主要优化点包括：

1. 使用curl_setopt_array函数设置CURL选项，简化代码。
2. 使用switch语句替代多个if语句，提高代码可读性。
3. 增加注释，提高代码可读性。
4. 优化变量命名，使代码更易理解