About PHP json_encode() function_PHP tutorial

Using the json_encode() built-in function in php (php > 5.2) can be used so that data in php can be transferred and used well with other languages.

The function of this function is to convert numerical values ​​into json data storage format.

<?php
$arr = array
       (
          'Name'=>'希亚',
          'Age'=>20
       );
$jsonencode = json_encode($arr);
echo $jsonencode;
?>

The results of running the program are as follows:

{"Name":null,"Age":20}

Chinese characters in the json_encode function are encoded as null. After searching on Google, it is very simple. In order to closely integrate with the front-end, Json only supports utf-8 encoding. I think it is because the front-end Javascript is also utf-8.

<?php
$array = array
	(
	 	'title'=>iconv('gb2312','utf-8','这里是中文标题'),
		'body'=>'abcd...'
	);
echo json_encode($array);
?>

The result of running this program is:

{"title":"u8fd9u91ccu662fu4e2du6587u6807u9898","body":"abcd..."}

All Chinese characters in the array are missing or u2353 etc. appear after json_encode.

The solution is to use the urlencode() function to process the following. Before json_encode, use urlencode() to process all the contents of all arrays, then use json_encode() to convert it into a json string, and finally use urldecode() to Convert the encoded Chinese back.

<?php
/**************************************************************
 *
 *	使用特定function对数组中所有元素做处理
 *	@param	string	&$array		要处理的字符串
 *	@param	string	$function	要执行的函数
 *	@return boolean	$apply_to_keys_also		是否也应用到key上
 *	@access public
 *
 *************************************************************/
function arrayRecursive(&$array, $function, $apply_to_keys_also = false)
{
    static $recursive_counter = 0;
    if (++$recursive_counter > 1000) {
        die('possible deep recursion attack');
    }
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            arrayRecursive($array[$key], $function, $apply_to_keys_also);
        } else {
            $array[$key] = $function($value);
        }
 
        if ($apply_to_keys_also && is_string($key)) {
            $new_key = $function($key);
            if ($new_key != $key) {
                $array[$new_key] = $array[$key];
                unset($array[$key]);
            }
        }
    }
    $recursive_counter--;
}
 
/**************************************************************
 *
 *	将数组转换为JSON字符串（兼容中文）
 *	@param	array	$array		要转换的数组
 *	@return string		转换得到的json字符串
 *	@access public
 *
 *************************************************************/
function JSON($array) {
	arrayRecursive($array, 'urlencode', true);
	$json = json_encode($array);
	return urldecode($json);
}
$array = array
       (
          'Name'=>'希亚',
          'Age'=>20
       );
echo JSON($array);
?>

This time it was successful, the results are as follows:

{"Name":"希亚","Age":"20"}

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