The JSON data can be obtained from the micro-port in bulk, but the return is null (resolved) when converting to an array with Json_decode

https_request是调用第三方接口的方法。

Print $output is a value, can see the Access_token, but the printing $jsoninfo is empty, so the back of the return Access_token also get not

        $output =$this->https_request($url);            $jsoninfo = json_decode($output, true);            $access_token = $jsoninfo["access_token"];            return $access_token;             

The problem is resolved
Cause: In the method of acquiring a third-party interface, there are already json_decode

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https_request是调用第三方接口的方法。

Print $output is a value, can see the Access_token, but the printing $jsoninfo is empty, so the back of the return Access_token also get not

        $output =$this->https_request($url);            $jsoninfo = json_decode($output, true);            $access_token = $jsoninfo["access_token"];            return $access_token;             

The problem is resolved
Cause: In the method of acquiring a third-party interface, there are already json_decode

That means json_decode it failed.
json_decodeafter json_last_error() that, use the function to see what the error is.

1. json字符串必须以双引号包含$output = str_replace("'", '"', $output);2. json字符串必须是utf8编码$output = iconv('gbk', 'utf8', $output);3.不能有多余的逗号 如：[1,2,]用正则替换掉，preg_replace('/,\s*([\]}])/m', '$1', $output)

Problems have been found, personal reasons

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