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代碼：

<?php
/**
 * PHP發(fā)送Json對象數(shù)據(jù)
 *
 * @param $url 請求url
 * @param $jsonStr 發(fā)送的json字符串
 * @return array
 */
function http_post_json($url, $jsonStr){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonStr);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json; charset=utf-8',
            'Content-Length: ' . strlen($jsonStr)
        )
    );
    $response = curl_exec($ch);//執(zhí)行一個cURL會話，成功時返回tru，失敗返回false
    $err = curl_error($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);//獲取最后一次傳輸?shù)南嚓P(guān)信息，最后一個收到的HTTP代碼

    curl_close($ch);
 
    return array($httpCode, $response, $err);
}

$time = time();

$url = "https://openapi.lechange.cn/openapi/accessToken";

$str = "phone:17691200000,time:{$time},nonce:49735441495760803893403522385895,appSecret:6d5c2c723dbb4ba78fac5a0e9ece81";

$str = md5($str);

$params = array(
            "system"=>array(
                'ver'=>'1.0',
                'sign'=>$str,
                'appid'=>'lcce1fdddaa5de4322',
                'time'=>"$time",
                'nonce'=>'49735441495760803893403522385895'
            ),
            "params"=>array("phone"=>"17691200000"),
            "id"=>"80"
        );

$jsonparams = json_encode($params);
echo $jsonparams;
list($returnCode, $returnContent, $err) = http_post_json($url, $jsonparams);

echo $returnCode;
var_dump($returnContent);
echo $err;
?>

執(zhí)行過程中，會報兩個錯。
（1）SSL certificate problem: unable to get local issuer certificate。在php.ini文件中加入下邊兩行代碼后，這個錯誤消失。

curl.cainfo="D:/wamp64/ca-bundle.crt"
openssl.cafile="D:/wamp64/ca-bundle.crt"

（2）以上錯誤消失后，就出現(xiàn)了

502 Bad Gateway
The proxy server received an invalid response from an upstream server.

現(xiàn)在真的是沒有辦法了。。即使參數(shù)，或者是簽名錯誤，那也是對方服務(wù)器返回一個錯誤碼，但是這個502是連返回錯誤碼的機會都不給了。求大神幫忙解決。