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Code:

<?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;
?>

During execution, two errors will be reported.
（1）SSL certificate problem: unable to get local issuer certificate. After adding the following two lines of code to the php.ini file, this error disappears.

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

(2) After the above error disappears,

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

There is really no other way now. . Even if the parameters or signature are wrong, the other server will return an error code, but this 502 does not even give the opportunity to return the error code. Ask God to help solve it.