php - A string processed by urldecode is used in an array element, causing json_encode to be unable to convert the array into a json string. How to solve the problem?

Question

$str = 'Success is 1% inspiration and %99 perspiration';
$urldecodeStr = urldecode($str);
$arr = [
        'doc' => $urldecodeStr
    ];
echo $urldecodeStr; //输出: Success is 1% inspiration and � perspiration
echo "<br>";
var_dump(json_encode($arr));//返回false

1. What is the reason why json_encode cannot be converted?

2. Is there any way to make the array $arr using $urldecodeStr be normally encoded into a json string by json_encode?

Answer 1

Question

1.json_encode cannot be converted due to encoding problems. When $str is converted to u8, %99 is a garbled code.
2. At present, I don’t know what the hell you are getting %99.
3. After you urldecode, the output will be garbled

Solution

1. Use the iconv function to transcode $str
2. Remove %99 (of course this is up to you)

Answer 2

Why directly urldecode the unencoded string

Answer 3

There may be something wrong with the string. . . In principle, json only supports UTF-8 encoding