PHP uses JSON example analysis_PHP tutorial-PHP Tutorial-php.cn

Encoding JSON in PHP (json_encode)

　PHP json_encode() function is used to encode JSON in PHP. This function returns the value represented by JSON on success, or FALSE on failure.

Grammar:

　string json_encode ( $value [, $options = 0 ] ) parameters:

Value: The value to be encoded. This function only applies to UTF-8 encoded data.

Options: This optional value is a bitmask consisting of JSON_HEX_TAG JSON_HEX_QUOT, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT

Example

The following example demonstrates how to convert an array to JSON using PHP:

The code is as follows

$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?>

代码如下

$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?>

在执行过程中，这将产生以下结果：

{"a":1,"b":2,"c":3,"d":4,"e":5}

When executed, this will produce the following results :

{"a":1,"b" :2,"c":3,"d":4,"e":5}

代码如下

class Emp {
public $name = "";
public $hobbies = "";
public $birthdate = "";
}
$e = new Emp();
$e->name = "sachin";
   $e->hobbies = "sports";
   $e->birthdate = date('m/d/Y h:i:s a', "8/5/1974 12:20:03 p");
   $e->birthdate = date('m/d/Y h:i:s a', strtotime("8/5/1974 12:20:03"));

echo json_encode($e);
?>

在执行过程中，这将产生以下结果：

{"name":"sachin","hobbies":"sports","birthdate":"08/05/1974 12:20:03 pm"}

The following example shows how a PHP object can be converted into JSON:

The code is as follows

class Emp {
public $name = "";
Public $hobbies = "";
Public $birthdate = "";
}
$e = new Emp();
$e->name = "sachin";
$e->hobbies = "sports";
$e->birthdate = date('m/d/Y h:i:s a', "8/5/1974 12:20:03 p");
$e->birthdate = date('m/d/Y h:i:s a', strtotime("8/5/1974 12:20:03"));

echo json_encode($e);
?>

When executed, this will produce the following results :

{"name":"sachin"," hobbies":"sports","birthdate":"08/05/1974 12:20:03 pm"}

Decoding JSON in PHP (json_decode)

　PHP json_decode() function is used to decode JSON in PHP. This function returns the value decoded from json into the appropriate PHP type.

Grammar:

Mixed json_decode ($json [,$assoc = false [, $depth = 512 [, $options = 0 ]]]) Parameters:

json_string: It must be a UTF-8 encoded data-encoded string

　assoc: This is a boolean type parameter. When set to TRUE, the returned object will be converted into an associative array

Depth: It is an integer type parameter that specifies the recursion depth

Options: It is a bit mask JSON decoding of integer type, supporting JSON_BIGINT_AS_STRING

Example

The following example shows how you can use PHP to decode a JSON object:

The code is as follows

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

代码如下

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>

在执行过程中，这将产生以下结果：

object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

var_dump(json_decode($json)); var_dump(json_decode($json, true));
?>

When executed, this will produce the following results :

object(stdClass)#1 (5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}

array(5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}

Suppose the JSON data we obtain is as follows: (can be obtained using curl, fsockopen, etc.)

The code is as follows

{
"translation":["Hello world"],
"query":"Hello world",
"errorCode":0,
"web":[
{
"value":["hello world"],
"key":"Hello World"
},
{
"value":["Hello World"],
"key":"Hello world"
}
]
}

代码如下

{
"translation":["Hello world"],
"query":"你好世界",
"errorCode":0,
"web":[
  {
   "value":["hello world"],
   "key":"你好世界"
  },
  {
   "value":["Hello World"],
   "key":"世界你好"
  }
]
}

用json_decode函数返回array的方式得到：

Array
(
[translation] => Array
  (
   [0] => Hello world
  )
[query] => 你好世界
[errorCode] => 0
[web] => Array
  (
   [0] => Array
    (
     [value] => Array
      (
       [0] => hello world
      )
     [key] => 你好世界
    )
   [1] => Array
    (
     [value] => Array
      (
       [0] => Hello World
      )
     [key] => 世界你好
    )
  )
)

Use the json_decode function to return array to get:

Array
(
[translation] => Array
(
[0] => Hello world
)
[query] => Hello world
[errorCode] => 0
[web] => Array
(
[0] => Array
(
[value] => Array
(
[0] => hello world
)
[key] => Hello World
)
[1] => Array
(
[value] => Array
(
[0] => Hello World
)
[key] => Hello world
)
)
)

We can use the following method to get the value we want in PHP language:

The code is as follows

/*----------------------------------
$data = '
{
"translation":["Hello world"],
"query":"Hello world",
"errorCode":0,
"web":[
{
"value":["hello world"],
"key":"Hello World"
},
{
"value":["Hello World"],
"key":"Hello world"
}
]
}
';
---------------------------------------------*/
$data = << {
"translation":["Hello world"],
"query":"Hello world",
"errorCode":0,
"web":[
{
"value":["hello world"],
"key":"Hello World"
},
{
"value":["Hello World"],
"key":"Hello world"
}
]
}
STR;
$jsondata=json_decode($data,true);
header("Content-Type: text/html; charset=UTF-8");
//print_r($jsondata);
echo "
".$jsondata['translation'][0]; //Hello world
echo "
".$jsondata['query']; //Hello world
echo "
".$jsondata['web'][0]['value'][0]; //hello world
echo "
".$jsondata['web'][1]['key']; //Hello world
?>

代码如下

/*----------------------------------
$data = '
{
"translation":["Hello world"],
"query":"你好世界",
"errorCode":0,
"web":[
{
"value":["hello world"],
"key":"你好世界"
},
{
"value":["Hello World"],
"key":"世界你好"
}
]
}
';
-------------------------------------*/
$data = << {
"translation":["Hello world"],
"query":"你好世界",
"errorCode":0,
"web":[
{
"value":["hello world"],
"key":"你好世界"
},
{
"value":["Hello World"],
"key":"世界你好"
}
]
}
STR;
$jsondata=json_decode($data,true);
header("Content-Type: text/html; charset=UTF-8");
//print_r($jsondata);
echo "
".$jsondata['translation'][0]; //Hello world
echo "
".$jsondata['query']; //你好世界
echo "
".$jsondata['web'][0]['value'][0]; //hello world
echo "
".$jsondata['web'][1]['key']; //世界你好
?>

Example, combined with database operation

The code is as follows

include './include/conn.php'; //Database link file
$sql_notice = mysql_query('SELECT * FROM gg_notice where enable = "1" limit 0,10');
$notice = mysql_fetch_array($sql_notice, MYSQL_ASSOC);
print_r ($notice);
?>

Tutorial provided by the first php website - Generate json format from data read from the database



            Please note the structural difference between the object arrays generated by the two methods


            
            echo '法一
';

            //Assume that the following array is generated based on the data we read from the database 

            $jarr=array('total'=>239,'row'=>array(

            array('code'=>'001','name'=>'China www.111cn.net','addr'=>'Address 11','col4'=>'col4 data'), 

            array('code'=>'002','name'=>'Name 2','addr'=>'Address 12','col4'=>'col4 data'),

            )

            );

            //Method 1: 

            $jobj=new stdclass();//Instantiate stdclass, which is an empty class built into PHP and can be used to transfer data. Since the data after json_decode is stored in the form of an object array, 

            //So when we generate it, we also need to store the data in the object

            foreach($jarr as $key=>$value){

            $jobj->$key=$value;

            }

            print_r($jobj);//Print the object after passing the attributes

            echo 'Use $jobj->row[0]['code'] to output array elements:'.$jobj->row[0]['code'].'
';

            echo 'Encoded json string:'.json_encode($jobj).'
';//Print the encoded json string
            

            echo '
';

            //Method 2: 

            echo 'Method 2
';

            echo 'Encoded json string:';

            echo $str=json_encode($jarr);//Encode the array into json

            echo '
';

            $arr=json_decode($str);//Decode json again

            print_r($arr);//Print the decoded array, the data is stored in the object array

            echo 'Use $arr->row[0]->code to output array elements:'.$arr->row[0]->code;
            ?>

Related labels：

encode json php 。 use function exist Case Analysis success coding return this

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