CONVERT JSON TO OBJECT PHP

A common use of JSON is lớn read data from a web server, and display the data in a web page.

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This chapter will teach you how khổng lồ exchange JSON data between the client và a PHP server.

The PHP File

PHP has some built-in functions lớn handle JSON.

Objects in PHP can be converted into JSON by using the PHP function json_encode() :

name = "John";$myObj->age = 30;$myObj->city = "New York";$myJSON = json_encode($myObj);echo $myJSON;?>

The Client JavaScript

Here is a JavaScript on the client, using an AJAX call to request the PHP tệp tin from the example above:

const xmlhttp = new XMLHttpRequest(); xmlhttp.onload = function() xmlhttp.open("GET", "demo_file.php"); xmlhttp.send();

PHP Array

Arrays in PHP will also be converted into JSON when using the PHP function json_encode() :

The Client JavaScript

Here is a JavaScript on the client, using an AJAX gọi to request the PHP tệp tin from the array example above:

var xmlhttp = new XMLHttpRequest(); xmlhttp.onload = function() xmlhttp.open("GET", "demo_file_array.php", true); xmlhttp.send();

PHP Database

PHP is a vps side programming language, and can be used lớn access a database.

Xem thêm: How To Select An Option By Its Option Text Using Jquery ? How To Get Selected Text From A Drop

Imagine you have a database on your server, và you want khổng lồ send a request khổng lồ it from the client where you ask for the 10 first rows in a table called "customers".

On the client, make a JSON object that describes the numbers of rows you want lớn return.

Before you send the request khổng lồ the server, convert the JSON object into a string & send it as a parameter lớn the url of the PHP page:

const limit = ; const dbParam = JSON.stringify(limit); xmlhttp = new XMLHttpRequest(); xmlhttp.onload = function() xmlhttp.open("GET","json_demo_db.php?x=" + dbParam); xmlhttp.send();

Example explained:

Define an object containing a "limit" property and value. Convert the object into a JSON string. Send a request to the PHP file, with the JSON string as a parameter. Wait until the request returns with the result (as JSON) Display the result received from the PHP file.

Take a look at the PHP file:

, false); $conn = new mysqli("myServer", "myUser", "myPassword", "Northwind"); $stmt = $conn->prepare("SELECT name FROM customers LIMIT ?");$stmt->bind_param("s", $obj->limit);$stmt->execute();$result = $stmt->get_result(); $outp = $result->fetch_all(MYSQLI_ASSOC);echo json_encode($outp);?>

PHP file explained:

Convert the request into an object, using the PHP function json_decode() . Access the database, và fill an array with the requested data. địa chỉ cửa hàng the array lớn an object, và return the object as JSON using the json_encode() function.

Use the Data

xmlhttp.onload = function() document.getElementById("demo").innerHTML = text; }

PHP Method = POST

When sending data lớn the server, it is often best lớn use the HTTP POST method.

To send AJAX requests using the POST method, specify the method, & the correct header.

The data sent khổng lồ the hệ thống must now be an argument khổng lồ the send() method:

const dbParam = JSON.stringify(); const xmlhttp = new XMLHttpRequest(); xmlhttp.onload = function() document.getElementById("demo").innerHTML = text; } xmlhttp.open("POST", "json_demo_db_post.php"); xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xmlhttp.send("x=" + dbParam);

$obj = json_decode($_POST<"x">, false); $conn = new mysqli("myServer", "myUser", "myPassword", "Northwind"); $stmt = $conn->prepare("SELECT name FROM customers LIMIT ?");$stmt->bind_param("s", $obj->limit);$stmt->execute();$result = $stmt->get_result(); $outp = $result->fetch_all(MYSQLI_ASSOC);echo json_encode($outp);?>
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