Detailed explanation of json_encode() function in php

I believe everyone knows that the json_encode() function in php is a built-in function , which can only be used in versions above php5.2. The json_encode() function uses the data in php to be well integrated with other languages. Pass it on and use it. Today we will introduce to you the son_encode() function in php!

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

<?php
$arr = array
       (
          &#39;Name&#39;=>&#39;希亚&#39;,
          &#39;Age&#39;=>20
       );

$jsonencode = json_encode($arr);
echo $jsonencode;
?>

The program running results are as follows:

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

The Chinese in the json_encode function is encoded as null. I Googled it and found it is very simple. In order to closely integrate with the front end, Json only supports utf-8 encoding. I think the Javascript on the front end is also the reason for utf-8.

<?php
$array = array
	(
	 	&#39;title&#39;=>iconv(&#39;gb2312&#39;,&#39;utf-8&#39;,&#39;这里是中文标题&#39;),
		&#39;body&#39;=>&#39;abcd...&#39;
	);

echo json_encode($array);
?>

The running result of this program is:

{"title":"\u8fd9\u91cc\u662f\u4e2d\u6587\u6807\u9898","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, and then use json_encode() to convert them into jsonString, 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(&#39;possible deep recursion attack&#39;);
    }
    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, &#39;urlencode&#39;, true);
	$json = json_encode($array);
	return urldecode($json);
}

$array = array
       (
          &#39;Name&#39;=>&#39;希亚&#39;,
          &#39;Age&#39;=>20
       );


echo JSON($array);
?>

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

{"Name":"希亚","Age":"20"}

Summary:

I believe that everyone can pass the example of the text Study and have a better understanding of the json_encode() function in PHP. I hope it will be helpful to your work!

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