<?php
/**
 * Send post request.
 *
 * @param string $url request url
 * @param string $imgPath 本地图片地址
 * @param string $from 翻译源语种
 * @param string $to 翻译目标语种
 * @param int $paste 贴合类型 0-不贴合 1-整图贴合 2-块区贴合
 * @return mixed
 */
function sendPostRequest(string $url, string $imgPath, string $from, string $to, int $paste = 0)
{
    $header = ['Content-Type' => 'multipart/form-data'];
    $formData = [
        'from' => $from,
        'to' => $to,
        'v' => 3,
        'paste' => $paste,
        'image' => '@' . realpath($imgPath) . ';type=image/jpeg',
    ];
    if (class_exists('CURLFile')) {
        $formData['image'] = new CURLFile(realpath($imgPath));
    }
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $formData);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $res = curl_exec($ch);
    curl_close($ch);
    
    return $res;
}

$token = '[调用鉴权接口获取的token]';// example: xxx
$url = 'https://aip.baidubce.com/file/2.0/mt/pictrans/v1?access_token=' . $token;
$imgPath = '本地文件绝对路径'; // example: /xx/xx.jpg
$from = '源语种方向'; // example: zh
$to = '目标语种方向'; // example: en
$paste = 1; //图片贴合类型
$res = sendPostRequest($url, $imgPath, $from, $to, $paste);
var_dump($res);