PHP uses JSON example analysis_PHP tutorial

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); ?> 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; ?>

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