<?php

require dirname(__FILE__, 2) . '/vendor/autoload.php';

$secretId = "SECRETID"; //Replace it with the actual `SecretId`, which can be viewed and managed in the CAM console at https://console.tencentcloud.com/cam/capi
$secretKey = "SECRETKEY"; //Replace it with the actual `SecretKey`, which can be viewed and managed in the CAM console at https://console.tencentcloud.com/cam/capi
$region = "ap-beijing"; //Replace it with the actual `region`, which can be viewed in the console at https://console.tencentcloud.com/cos5/bucket
$cosClient = new Qcloud\\Cos\\Client(
    array(
        'region' => $region,
        'schema' => 'https', //Protocol header, which is http by default
        'credentials'=> array(
            'secretId'  => $secretId ,
            'secretKey' => $secretKey)));
try {
    // 1. For more information on file transcoding, visit https://www.tencentcloud.com/document/product/460/47074?from_cn_redirect=1.
    $bucket = 'examplebucket-1250000000';
    $key = 'exampleobject';
    $url = $cosClient->getObjectUrl($bucket, $key);
    $params = array(
        'ci-process' => 'doc-preview',
//        'srcType' => '',
        'page' => 3,
        'dstType' => 'png',
//        'password' => '',
//        'comment' => '',
//        'sheet' => '',
//        'excelPaperDirection' => '',
//        'excelRow' => '',
//        'excelCol' => '',
//        'excelPaperSize' => '',
//        'txtPagination' => '',
        'ImageParams' => 'imageMogr2/thumbnail/!50p',
//        'quality' => '',
//        'scale' => '',
//        'imageDpi' => '',
    );
    $query = http_build_query($params);
    echo $url . $query; // The generated accessible URL
} catch (\\Exception $e) {
    // Request failed
    echo($e);
}

Sync request URL
https://examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com/example.ppt?sign=q-sign-algorithmxxxxxxxxxxxxx&ci-process=doc-preview&page=1&dstType=png