how to get data from json array in php | json in php

how to get data from json array in php | json in php | json decode and encode in php

This chapter covevironment to start our programming with PHP for JSON.rs how to encode and decode JSON objects using the PHP programming language. Let’s start with preparing the en

 

Environment

As of PHP 5.2.0, the JSON extension is bundled and compiled into PHP by default.

JSON Functions

Function Libraries

json_encode Returns the JSON representation of a value.

json_decode Decodes a JSON string.

json_last_error Returns the last error occurred.

Encoding JSON in PHP (json_encode)

PHP json_encode() function is used for encoding JSON in PHP. This function returns the JSON representation of a value on success or FALSE on failure.

Related :

Syntax

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

Parameters

value − The value being encoded. This function only works with UTF-8 encoded data.

options − This optional value is a bitmask consisting of 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 shows how to convert an array into JSON with PHP −

$arr = array(‘a’ => 1, ‘b’ => 2, ‘c’ => 3, ‘d’ => 4, ‘e’ => 5);

echo json_encode($arr);

 

result –

{“a”:1,”b”:2,”c”:3,”d”:4,”e”:5}

The following example shows how the PHP objects can be converted into JSON −

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);

 

While executing, this will produce the following result −

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

Decoding JSON in PHP (json_decode)

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

Syntax

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

Paramaters

json_string − It is an encoded string which must be UTF-8 encoded data.

assoc − It is a boolean type parameter, when set to TRUE, returned objects will be converted into associative arrays.

depth − It is an integer type parameter that specifies recursion depth

options − It is an integer type bitmask of JSON decode, JSON_BIGINT_AS_STRING is supported.

Example

The following example shows how PHP can be used to decode JSON objects −

$json = ‘{“a”:1,”b”:2,”c”:3,”d”:4,”e”:5}’;

var_dump(json_decode($json));

var_dump(json_decode($json, true));

While executing, it will produce the following result −

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)

}

 

PHP JSON

PHP allows us to encode and decode JSON by the help of json_encode() and json_decode functions.

1) PHP json_encode

The json_encode() function returns the JSON representation of a value. In other words, it converts PHP variables (containing array) into JSON.

Syntax:

string json_encode ( mixed $value [, int $options = 0 [, int $depth = 512 ]] )

PHP json_encode example 1

Let’s see the example to encode JSON.

 

$arr = array(‘a’ => 1, ‘b’ => 2, ‘c’ => 3, ‘d’ => 4, ‘e’ => 5);

echo json_encode($arr);

Output

{“a”:1,”b”:2,”c”:3,”d”:4,”e”:5}

PHP json_encode example 2

Let’s see the example to encode JSON.

$arr2 = array(‘firstName’ => ‘Rahul’, ‘lastName’ => ‘Kumar’, ’email’ => ‘rahul@gmail.com’);    

echo json_encode($arr2);   

 

Output

{“firstName”:”Rahul”,”lastName”:”Kumar”,”email”:”rahul@gmail.com”}

 

2) PHP json_decode

The json_decode() function decodes the JSON string. In other words, it converts JSON string into a PHP variable.

 

Syntax:

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

PHP json_decode example 1

Let’s see the example to decode JSON string.

$json = ‘{“a”:1,”b”:2,”c”:3,”d”:4,”e”:5}’;  

var_dump(json_decode($json, true));//true means returned object will be converted into associative array  

 

Output

array(5) {

[“a”] => int(1)

[“b”] => int(2)

[“c”] => int(3)

[“d”] => int(4)

[“e”] => int(5)

}

 

PHP json_decode example 2

Let’s see the example to decode JSON string.

$json2 = ‘{“name” : “Vikram”, “lastName” : “Kuldeep”, “email” : “Vikramkuldeep830@gmail.com”}’;

var_dump(json_decode($json2, true));

 

Output

array(3) { 

[“firstName”]=> string(5) “vikram” 

[“lastName”]=> string(5) “Kuldeep” 

[“email”]=> string(15) “vikramkuldeep830@gmail.com” 

}

 

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