Detailed explanation of PHP json_encode() function

This article mainly introduces the detailed explanation of the PHP json_encode() function. Interested friends can refer to it. I hope it will be helpful to everyone.

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
  (
   &#39;Name&#39;=>&#39;希亚&#39;,
   &#39;Age&#39;=>
  );
$jsonencode = json_encode($arr);
echo $jsonencode;
?>

The results of running the program are as follows:

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

The Chinese in the json_encode function is encoded as null. I Googled it. It's very simple. In order to be closely integrated with the front end, Json only supports utf- encoding. I think it's because the front-end Javascript is also utf-.

<?php
$array = array
 (
  &#39;title&#39;=>iconv(&#39;gb&#39;,&#39;utf-&#39;,&#39;这里是中文标题&#39;),
  &#39;body&#39;=>&#39;abcd...&#39;
 );
echo json_encode($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, then use json_encode() to convert it into a json string, and finally use urldecode () 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 $recursive_counter = ;
 if (++$recursive_counter > ) {
  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);
}
$array = array
  (
   &#39;Name&#39;=>&#39;希亚&#39;,
   &#39;Age&#39;=>
  );
echo JSON($array);
?>

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

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

Summary: The above is The entire content of this article is hoped to be helpful to everyone's study.

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