PHP using JSON instance analysis

Source: Internet
Author: User
Tags execution php language json php json print object

Encoding json in PHP (Json_encode)

The PHP Json_encode () function is used in PHP JSON encoding. This function returns the value represented by the JSON successfully and returns false if it fails.

Grammar:

String Json_encode ($value [, $options = 0]) parameter:

Value: The number to encode, which applies only to UTF-8 encoded data.

Options: This optional value is a bit mask, by 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 shows how to convert a PHP array into JSON:

The code is as follows

<?php
$arr = Array (' A ' => 1, ' B ' => 2, ' C ' => 3, ' d ' => 4, ' E ' => 5);
echo Json_encode ($arr);
?>

During execution, this produces the following results:

{"A": 1, "B": 2, "C": 3, "D": 4, "E": 5}

The following example shows how to convert a PHP object to JSON:

The code is as follows

<?php
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);
?>

During execution, this produces the following results:

{"Name": "Sachin", "hobbies": "Sports", "Birthdate": "08/05/1974 12:20:03 PM"}

Decoding JSON in PHP (Json_decode)

The PHP Json_decode () function is used to decode json in PHP. This function returns the value from JSON and decodes it into the appropriate PHP type.

Grammar:

Mixed Json_decode ($json [, $assoc = False [, $depth = [, $options = 0]]] parameter:

Json_string: It must be a UTF-8 encoded string of data encoded

Assoc: This is when a Boolean type parameter is set to True, the returned object is converted to an associative array

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

Options: It is an integer type of bit mask JSON decoder that supports json_bigint_as_string

Example

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

The code is as follows

<?php
$json = ' {' A ': 1, "B": 2, "C": 3, "D": 4, "E": 5} ';

Var_dump (Json_decode ($json));
Var_dump (Json_decode ($json, true));
?>

During execution, this produces 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)
}

If we get the JSON data as follows: (can be obtained using curl, fsockopen, etc.)

  code is as follows &nbs P;

{
  "translation": ["Hello World"],
  "query": "Hello Worlds ",
 " ErrorCode ": 0,
 " web ": [
  {
   " value ": [" Hello World "],
    "key": "Hello World"
  },
  {
    "value": ["Hello Worlds"],
    "key": "Hello World"
  
 ]

Returns an array with the Json_decode function:

Array
(
 [translation] => Array
   (
   [0] => Hello World
& nbsp; )
 [query] => Hello World
 [errorcode] => 0
 [web] => Array
   (
   [0] => Array
     (
     [value] => Array
       (
&Nbsp;      [0] => Hello World
      )
      [key] => Hello World
    )
   [1] => Array
     (
     [value] => Array
        (
       [0] => Hello World
       )
     [key] => World Hello
    )
  )

We can get the values we want in the PHP language in the following ways:

  code is as follows &nbs P;

<?php
/*----------------------------------
$data = '
{
  "translation": ["Hello World"],
  "query": "Hello Worlds",
  "ErrorCode": 0,
  "web": [
  {
    "value": ["Hello World"],
    "key": "Hello Worlds"
  },
  {
    "value": ["Hello World"],
    "key": "Hello Worldwide"
  &NBSP}
 ]

';
-------------------------------------*/
$data = <<<str
{
  "translation": ["Hello World"],
  "query": "Hello Worlds",
  "ErrorCode": 0,
  "web": [
  {
    "value": ["Hello World"],
    "key": "Hello Worlds"
  },
  {
    "value": ["Hello World",
    "key": "Hello World"
  
 ]
}
STR;
$jsondata =json_decode ($data, true);
Header ("content-type:text/html; Charset=utf-8 ");
//print_r ($jsondata);
echo "<br/>". $jsondata [' translation '][0];//hello World
echo "<br/>". $jsondata [' query ']; br> echo "<br/>". $jsondata [' web '][0][' value '][0]; Hello World
echo "<br/>". $jsondata [' web '][1][' key '];//Hello!

example, combined with database operation

The code is as follows

&lt;?php


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);


?&gt;


&lt;! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "&gt;


&lt;html xmlns= "http://www.w3.org/1999/xhtml" &gt;


&lt;head&gt;

Tutorials from
&lt;title&gt; first PHP web--Generate JSON format for data read from database &lt;/title&gt;


&lt;meta http-equiv= "Content-type" content= "text/html"; Charset=utf-8 "/&gt;


&lt;!--&lt;script src= "http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js" type= "Text/javascript" &gt;&lt;/script&gt;--&gt;


&lt;script language=javascript&gt;


&lt;/script&gt;


&lt;/head&gt;


&lt;body&gt;


&lt;pre&gt;


&lt;h1&gt; Note the structural differences in the array of objects generated by the two methods &lt;/h1&gt;


&lt;?php


Echo ' &lt;h1&gt; law i &lt;/h1&gt; ';


//Assume that the following arrays are generated from data that we read from the database


$jarr =array (' Total ' =&gt;239, ' Row ' =&gt;array (


Array (' Code ' =&gt; ' 001 ', ' name ' =&gt; ' China www.111cn.net ', ' addr ' =&gt; ' address one, ' col4 ' =&gt; ' col4 ' data '),


Array (' Code ' =&gt; ' 002 ', ' name ' =&gt; ' Name 2 ', ' addr ' =&gt; ', ' address ', ' col4 ' =&gt; ' col4 ' data '),


)


           );


//Fayi:


$jobj =new Stdclass ()//instantiate Stdclass, which is a built-in null class in PHP that can be used to pass data, since Json_decode data is stored as an array of objects,


//So when we build, we also store the data in the object


foreach ($jarr as $key =&gt; $value) {


$jobj-&gt; $key = $value;


}


Print_r ($jobj);//Print object after passing property


Echo ' uses $jobj-&gt;row[0][' code ' to output an array element: '. $jobj-&gt;row[0][' code '. ' &lt;br&gt; ';


echo ' encoded JSON string: '. Json_encode ($jobj). ' &lt;br&gt;//Print encoded JSON string


Echo ' Law II:
Echo ' Echo ' encoded JSON string: ';
echo $str =json_encode ($jarr);//JSON encoding the array
Echo ' <br> ';
$arr =json_decode ($STR);//JSON decoding
Print_r ($arr);//print decoded array, data stored in an object array
Echo ' uses $arr->row[0]->code to output array elements: '. $arr->row[0]->code;

?>

</body>

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