Obtain user information in batches from WeChat to obtain json data. However, if json_decode is used to convert the data into an array, the return value is null (solved)

{Code ...} printing $ output has a value. you can see access_token, but it is blank when printing $ jsoninfo. Therefore, the returned access_token cannot be obtained {code ...} cause solved: json_decode already exists in the method for obtaining third-party interfaces.

Https_request is a method to call a third-party interface.

Printing $ output has a value. you can see access_token, but it is null when printing $ jsoninfo. Therefore, the returned access_token cannot be obtained.

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

Problem solved
Cause: json_decode already exists in the method for obtaining third-party interfaces.

Reply content:

Https_request is a method to call a third-party interface.

Printing $ output has a value. you can see access_token, but it is null when printing $ jsoninfo. Therefore, the returned access_token cannot be obtained.

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

Problem solved
Cause: json_decode already exists in the method for obtaining third-party interfaces.

That is to sayjson_decodeFailed.
Injson_decodeUse laterjson_last_error()Function to see what is wrong.

1. json strings must contain $ output = str_replace ("'",' "', $ output); 2. the json string must be UTF-8 encoded $ output = iconv ('gbk', 'utf8', $ output); 3. there cannot be redundant commas, for example, [,], replace with regular expressions, preg_replace ('/, \ s * ([\]}])/M',' $1 ', $ output)

Problem Found, personal reason