json_encode() function in PHP

 <!DOCTYPE html>

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>PHP with Ajax & JSON</title>
    <link rel="stylesheet" href="css/style.css">
</head>

<body>
    <div id="main">
        <div id="header">
            <h1>PHP with Ajax & JSON</h1>
        </div>

        <div id="load-data">
            <table id="load-table" border="1" cellpadding="10px" width="100%">
                <tr>
                    <th>Id</th>
                    <th>Student Name</th>
                    <th>Age</th>
                    <th>City</th>
                </tr>
            </table>
        </div>
    </div>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script>
        $.ajax({
            url: "fetch-json.php",
            type: "POST",
            data: {
                id: 4
            },
            dataType: "JSON",
            success: function(data) {
                $.each(data, function(key, value) {
                    $("#load-table").append("<tr><td>" + value.id + "</td><td>" + value.student_name + "</td><td>" + value.age + "</td><td>" + value.city + "</td></tr>");
                });
            }
        });


        // $.getJSON(
        //     "fetch-json.php",
        //     function(data) {
        //         $.each(data, function(key,value){
        //             $("#load-table").append("<tr><td>" + value.id + "</td><td>" + value.student_name + "</td><td>" + value.age + "</td><td>" + value.city + "</td></tr>");
        //         });
        //         console.log(data);
        //     }
        // );
    </script>
</body>

</html>






Below is fetch-json.php File
<?php
include("mysqli_conn.php");

$sql = "SELECT * FROM students";
// $sql = "SELECT * FROM students WHERE id = {$_POST['id']}";  //For getting any particular record based on id

$result = $conn->query($sql);
// The fetch_all() / mysqli_fetch_all() function fetches all result rows and returns the result-set as an associative array, a numeric array, or both
// $output = mysqli_fetch_all($result);         //Procedural style
$output = $result->fetch_all(MYSQLI_ASSOC);    //Object oriented style

// echo "<pre>";
// print_r($output);
// echo "</pre>";

// The json_encode() function is used to encode a value to JSON format.
echo json_encode($output);







Below is css/style.css File
body {
    font-family: arial;
    background-color: #b2bec3;
    padding: 0;
    margin: 0;
}

h1 {
    text-align: center;
    margin: 0;
}

#main {
    width: 700px;
    margin: 0 auto;
    background: #ffffff;
    font-size: 19px;
}

#header {
    background: #6c5ce7;
    color: #ffffff;
    padding: 15px;
}

#load-data {
    padding: 15px;
    min-height: 500px;
}






Below is mysqli_conn.php File which is included in above Files.
<?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "test";

//Create Connection
$conn = new mysqli($servername, $username, $password, $database);

//Check Connection
if ($conn->connect_error) {
    die("Connection Failed: " . $conn->connect_error);
}






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