PHP Tutorials
PHP Introduction
PHP Install
PHP Syntax
PHP Echo/Print
PHP Comments
PHP Variables
PHP DataTypes
PHP Numbers
PHP Math
PHP Strings
PHP If..else
PHP Operators
PHP Loops
PHP Functions
PHP Forms
PHP Form Handling
PHP Form Validation
PHP Form Required
PHP Form Complete
PHP Advanced
PHP Include
PHP File Handling
PHP Cookies
PHP Sessions
PHP Filters
PHP JSON
PHP Exceptions
PHP OOP
PHP What is OOP
PHP OOP Classes/Objects
PHP Constructors
PHP Destructors
PHP Access Modifiers
PHP Interfaces
PHP Traits
PHP Iterables
Previous
PHP and JSON
What is JSON?
JSON stands for JavaScript Object Notation, and is a syntax for storing and exchanging data.
Since the JSON format is a text-based format, it can be easily exported from a server, and used as a data format in any programming language.
PHP and JSON
PHP has built-in JSON host functions.
First, we will consider two of the following activities:
json_encode()json_decode()
PHP - json_encode()
The json_encode() function is used to write the value in the JSON format.
Example
This example shows how to encode an associative array into a JSON object:
<?php
$age = array("Peter"=>35, "Ben"=>37, "Joe"=>43);
echo json_encode($age);
?>
Example
This example shows how to encode an indexed array into a JSON array:
<?php
$cars = array("Volvo", "BMW", "Toyota");
echo json_encode($cars);
?>
PHP - json_decode()
The json_decode() function is used to record a JSON object into a PHP object or associative array.
Example
This example decodes JSON data into a PHP object:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
var_dump(json_decode($jsonobj));
?>
The json_decode() function returns the object automatically.
The json_decode() function has a second parameter, and when set to true, JSON objects are categorized into identical lists.
Example
This example decodes JSON data into a PHP associative array:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
var_dump(json_decode($jsonobj,
true));
?>
PHP - Accessing the Decoded Values
Here are two examples of how to access the values recorded in an item and from a combined system:
Example
This example shows how to access the values from a PHP object:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
$obj = json_decode($jsonobj);
echo $obj->Peter;
echo $obj->Ben;
echo $obj->Joe;
?>
Example
This example shows how to access the values from a PHP associative array:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
$arr = json_decode($jsonobj, true);
echo $arr["Peter"];
echo $arr["Ben"];
echo $arr["Joe"];
?>
PHP - Looping Through the Values
You can also override values with loop foreach():
Example
This example shows how to loop through the values of a PHP object:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
$obj = json_decode($jsonobj);
foreach($obj
as $key => $value) {
echo $key . " => " . $value . "<br>";
}
?>
Example
This example shows how to loop through the values of a PHP associative array:
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
$arr = json_decode($jsonobj, true);
foreach($arr as $key => $value) {
echo $key . " => " . $value
. "<br>";
}
?>