php Control character error, possibly incorrectly encoded ?

Question

// $s='{"test":"json"}';
$s='{"test":"    json"}';//json前面有个占一个长度的不可见字符 好像保存后 sf 处理成空格了，点击编辑可以看到 一个复制出来的字符 http://ascii-code.com/ http://stackmirror.bird.so/page/s1dxa25hkmd4 http://stackmirror.bird.so/page/467s1u1mvxx JSON.stringify(s)显示是 `\t`
echo '<pre>';echo PHP_EOL;

print_r(json_decode($s,1));
print_r(json_last_error_msg());//Control character error, possibly incorrectly encoded
echo PHP_EOL;
switch (json_last_error()) {
        case JSON_ERROR_NONE:
            echo ' - No errors';
        break;
        case JSON_ERROR_DEPTH:
            echo ' - Maximum stack depth exceeded';
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo ' - Underflow or the modes mismatch';
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo ' - Unexpected control character found';
        break;
        case JSON_ERROR_SYNTAX:
            echo ' - Syntax error, malformed JSON';
        break;
        case JSON_ERROR_UTF8:
            echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
        break;
        default:
            echo ' - Unknown error';
        break;
    }
//输出 - Unexpected control character found

目前找到一个方案，来自 json_decode 无法解析，那就试试 Services_JSON

include 'JSON.php';//https://github.com/pear/Services_JSON
$json = new Services_JSON(SERVICES_JSON_LOOSE_TYPE);
$data = $json->decode($s);

function strip_control_characters($str){
    return preg_replace('/[\x00-\x1F\x7F-\x9F]/u', '', $str);
}

Answer 1

大概猜到可能是零宽字符，产生了控制字符错误，由于在下复制不到你发的东西，楼主试试先转码再解Json呢

$strEncode = mb_convert_encoding($str, 'UTF-8', $s);

// $s='{"test":"json"}';

$s='{"test":"    json"}';//json前面有个占一个长度的不可见字符 好像保存后 sf 处理成空格了，点击编辑可以看到 一个复制出来的字符 http://ascii-code.com/ http://stackmirror.bird.so/page/s1dxa25hkmd4 http://stackmirror.bird.so/page/467s1u1mvxx 

$strEncode = mb_convert_encoding($str, 'UTF-8', $s);
echo '<pre>';echo PHP_EOL;

print_r(json_decode($s,1));
print_r(json_last_error_msg());//Control character error, possibly incorrectly encoded
echo PHP_EOL;
switch (json_last_error()) {
        case JSON_ERROR_NONE:
            echo ' - No errors';
        break;
        case JSON_ERROR_DEPTH:
            echo ' - Maximum stack depth exceeded';
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo ' - Underflow or the modes mismatch';
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo ' - Unexpected control character found';
        break;
        case JSON_ERROR_SYNTAX:
            echo ' - Syntax error, malformed JSON';
        break;
        case JSON_ERROR_UTF8:
            echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
        break;
        default:
            echo ' - Unknown error';
        break;
    }
//输出 - Unexpected control character found

Answer 2

$json = preg_replace('/[[:cntrl:]]/mu', '', $json);