PHP Working With JSON APIs


title: Working With JSON APIs

Working With JSON APIs

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

This chapter will teach you how to exchange JSON data between the client and a PHP server.

The PHP File

PHP has some built-in functions to handle JSON.

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

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

Try it

The Client JavaScript

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

Example

Use JSON.parse() to convert the result into a JavaScript object:

var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { var myObj = JSON.parse(this.responseText); document.getElementById("demo").innerHTML = myObj.name; } }; xmlhttp.open("GET", "demo_file.php", true); xmlhttp.send();

Try it

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