PHP模拟浏览器上传文件(数据流形式上传)

用PHP上传文件基本都是临时存储，之后上传，怎么用PHP模拟浏览器以数据流形式上传文件

思路及代码如下：

//网址 参数 文件
function upload($url, $p, $file) {
    $param = [
        //此处根据实际文件的上传的 name 填写
        'fileData' => file_get_contents(realpath($file)),
    ];
    if (!empty($p)) {
        arrary_merge($p, $param);
    }
    $delimiter = uniqid();
    $data = '';
    $eol = "\r\n";
    $upload = $param['fileData'];
    unset($param['fileData']);
    foreach ($param as $name => $content) {
        $data .= "--" . $delimiter . "\r\n"
            . 'Content-Disposition: form-data; name="' . $name . "\"\r\n\r\n"
            . $content . "\r\n";
    }
    // 拼接文件流  name="fileData"; filename="1.png"' 根据实际的文件 name 和名字填写 或写个变量
    //'Content-Type: image/gif'可改为'Content-Type:application/octet-stream' 由于我是测试的网站必须为 gif 所以就这样吧先
    $data .= "--" . $delimiter . $eol
        . 'Content-Disposition: form-data; name="fileData"; filename="1.png"' . "\r\n"
        . 'Content-Type: image/gif' . "\r\n\r\n";
 
    $data .= $upload . "\r\n";
    $data .= "--" . $delimiter . "--\r\n";
    $post_data = $data;
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_HTTPHEADER, [
        "Content-Type: multipart/form-data; boundary=" . $delimiter,
        "Content-Length: " . strlen($post_data),
    ]);
    $response = curl_exec($curl);
    curl_close($curl);
    return $response;
}

请根据实际情况进行实际调用