PHP에서 스트리밍 파일을 보내고 받는 방법

<?php
/** php 发送流文件
* @param  String  $url  接收的路径
* @param  String  $file 要发送的文件
* @return boolean
*/
function sendStreamFile($url, $file){
    if(file_exists($file)){
        $opts = array(
            &#39;http&#39; => array(
                &#39;method&#39; => &#39;POST&#39;,
                &#39;header&#39; => &#39;content-type:application/x-www-form-urlencoded&#39;,
                &#39;content&#39; => file_get_contents($file)
            )
        );
        $context = stream_context_create($opts);
        $response = file_get_contents($url, false, $context);
        $ret = json_decode($response, true);
        return $ret[&#39;success&#39;];
    }else{
        return false;
    }
}
$ret = sendStreamFile(&#39;http://localhost/fdipzone/receiveStreamFile.php&#39;, &#39;send.txt&#39;);
var_dump($ret);
?>