The php json_encode() function returns the json data instance code, json_encodejson_PHP tutorial

php json_encode() function returns json data instance code, json_encodejson

json_encode() function usage.

echo json_encode(array('a'=>'bbbb','c'=>'ddddd');

This will generate a standard json format data

The code is as follows

<&#63;php

//需要执行的SQL语句
//单条
$sql="select id,name from tbl_user where id=1";
//多条数据
//$sql="select id,name from tbl_user";

//调用conn.php文件进行数据库操作
require('Conn.php');

//提示操作成功信息，注意：$result存在于conn.php文件中，被调用出来
if($result)
{

// $array=mysql_fetch_array($result,MYSQL_ASSOC);


/*数据集

$users=array();
$i=0;
while($row=mysql_fetch_array($result,MYSQL_ASSOC)){

echo $row['id'].'-----------'.$row['name'].'</br>';
$users[$i]=$row;
$i++;

}
echo json_encode(array('dataList'=>$users));

*/

/*单条数据*/

$row=mysql_fetch_row($result,MYSQL_ASSOC);

echo json_encode(array('jsonObj'=>$row));
}

mysql_free_result($result);
//释放结果
mysql_close();
//关闭连接

&#63;>

The above is the json data generated by the database

Single piece of data: {"jsonObj":{"id":"1","name":"lmw"}}

Multiple pieces of data: {"dataList":[{"id":"1","name":"lmw"},{"id":"2","name":"xxj"},{ "id":"3","name":"xxxj"}]}

In many cases now, we need the program to return a result in Json format, such as:

The code is as follows

Copy code The code is as follows:

{
"UserKeyGetResponse":
{"RequestName":"e99e6d63e8c712d7699f52978a","api_key_value":"41954dd9b1cb6a95802eab6810"},
"error_response":
{"code":"NO_ERROR(www.jb51.net)","msg":"Get system parameters successfully"}
}

The result can be written in the form of an array like this:

Copy code The code is as follows:

$respon = array('UserKeyGetResponse' => array('RequestName' => $api_request_name, 'api_key_value' => $api_key_value),
'error_response' => array('code' => 'NO_ERROR', 'msg' => 'Get system parameters successfully'));

Code

Copy code The code is as follows:

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--;
}
g:
$error_respon = array('code' => 'ERROR_MSG_MISS', 'msg' => 'Message does not exist');
echo JSON($array);

The result is:

{"code":"ERROR_MSG_MISS","msg":"Message does not exist"}
The client can parse the result. Of course, the error code must be replaced by a number.

This is much better. What we display is Chinese directly. Of course, there is no problem in displaying the hexadecimal encoding.

Teaching PHP json code examples

Use the json_decode function to decrypt the data. . The function for PHP to apply JSON is: json_encode($PHPcode);
The function for PHP to parse JSON is: json_decode($JSONcode); so there are many forms of JSON, and different forms have different forms after being interpreted by PHP. . //Form 1: It is completely in the form of an object. This form of data is also called a related array in Javascript. Different from ordinary arrays, it can be accessed through a string as an index (use "[]" or "." to represent the level) $json='{"item1":{"item11":{"n":"chenling", "m":"llll"},"sex":"male","age":"25 "},"item2": {"item21":"ling","sex":"女","age":"24"}}'; $J=json_decode($json); print_r($J); Take a look at this article about php operating json data from the PHP Beginner's Guide: www.phpnewer.com/index.php/Cjwt/detail/id/147

php code for outputting JSON data

Dear, you didn’t execute it in the environment at all. You need to compile it with php+apache

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