PHP发送post请求

<?php 
function postPHP($con){
　　$str=json_encode($con['data']);//如果传的不是json字符串的话需要转一下
    $str=$con['data'];
    $context=array('http'=>
        array(
            'method'=>'POST',
            'header'=>'Content-type:application/json;charset=utf-8'."
".
            "Authorization:Basic".base64_encode($con['userid'].":".$con['password'])."
".
            'Content-length'.strlen($str),
            'content'=>$str
        )
    );
    $contextid=stream_context_create($context);
    $scok=fopen($con['url'],'r',false,$contextid);
    if($scok){
        $result='';
        while(!feof($scok)){
            $result.=fgets($scok,4096);
        }
　　　　　fclose($scok);
        return $result;
    }else{
        return $str;
    }
}
//单独写一个文件
$data=$_post['json'];/**传的json字符串格式数据,如果数据格式是json字符串时postPHP方法里就不需要json_enode了*/
$arr=array('data'=>$data,'url'=>'http://1.1.1.1');
$datas = postPHP($arr);
echo $datas;