About PHP json_encode() function_PHP tutorial-PHP Tutorial-php.cn

About PHP json_encode() function_PHP tutorial

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Release： 2016-07-13 10:33:16

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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;
?>

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The results of running the program are as follows:

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

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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);
?>

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The result of running this program is:

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

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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);
?>

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

{"Name":"希亚","Age":"20"}

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