PHP JSON

PHP JSON

In this chapter we will introduce how to use PHP language to encode and decode JSON objects.

Environment configuration

JSON extension has been built-in in php5.2.0 and above.

JSON function

json_encode

PHP json_encode() is used to JSON encode variables. This function returns JSON data if executed successfully, otherwise it returns FALSE.

Syntax

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

Parameters

·            Value: The value to be encoded. This function is only valid for UTF-8 encoded data.

· options: Binary mask composed of the following constants: JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT

Example

The following example demonstrates Got it How to convert PHP array to JSON format data:

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

The execution result of the above code is:

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

The following example demonstrates how to convert PHP objects into JSON format data:

<?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);
?>

The execution result of the above code is:

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

json_decode

PHP The json_decode() function is used to decode JSON format strings and convert them into PHP variables.

Syntax

mixed json_decode ($json [,$assoc = false [, $depth = 512 [, $options = 0 ]]])

Parameters

·         json_string: The JSON string to be decoded must be UTF-8 encoded data

·          assoc: When this parameter is TRUE, an array will be returned, and when FALSE, an object will be returned.

·               depth: A parameter of integer type, which specifies the recursion depth

·           options: Binary mask, currently only JSON_BIGINT_AS_STRING is supported.

Example

The following example demonstrates how to decode JSON data:

<?php
   $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
 
   var_dump(json_decode($json));
   var_dump(json_decode($json, true));
?>

The execution result of the above code is:

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)

}