php - file_get_contents($url); input json

Question

Use file_get_contents($url); to return json. It cannot be parsed using json_decode. What should I do? I have also used the curl method, but it does not work

Answer 1

This problem has been solved by myself. The data returned by the third party is ascll, so it needs to be converted into utf-8 format. It has nothing to do with json_decode

Answer 2

You need to verify whether the format is correct, do not upload the code on BB:

<?php
function treatJsonString($string)
{
    $jsonData = json_decode($string, true);

    switch (json_last_error()) {
        case JSON_ERROR_NONE:
            return $jsonData;
            break;
        case JSON_ERROR_DEPTH:
            print '[Error] - Maximum stack depth exceeded' . PHP_EOL;
            break;
        case JSON_ERROR_STATE_MISMATCH:
            print '[Error] - Underflow or the modes mismatch' . PHP_EOL;
            break;
        case JSON_ERROR_CTRL_CHAR:
            print '[Error] - Unexpected control character found' . PHP_EOL;
            break;
        case JSON_ERROR_SYNTAX:
            print '[Error] - Syntax error, malformed JSON' . PHP_EOL;
            break;
        case JSON_ERROR_UTF8:
            print '[Error] - Malformed UTF-8 characters, possibly incorrectly encoded' . PHP_EOL;
            break;
        default:
            print '[Error] - Unknown error' . PHP_EOL;
            break;
    }
    return null;
}


$jsonString = '{"x":123,"s":[{"a":"1"}]';

var_dump(treatJsonString($jsonString));

Answer 3

First check whether your json is in normal json format
Then check whether your php file is utf-8 without BOM
I have encountered similar problems before, and it will be fine after removing the BOM~

Answer 4

Send the returned data and take a look

Answer 5

No problem, I analyzed it:

Answer 6

json_decode($json, true)

With true, it means it will be parsed into an array of php

Answer 7

Confirm first. Is the returned thing json?

Answer 8

First, make sure your Json is escaped in other ways. If not, you can use the Json formatting verification tool to check if there is a problem.

Online Json format verification tool
http://www.bejson.com/

Answer 9

No problem, I suggest you check it carefully

Answer 10

Double check whether the JSON data format is correct