how to get last inserted id in php mysqli code example

Example 1: get id of record created php

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '[email protected]')";

if (mysqli_query($conn, $sql)) {
    $last_id = mysqli_insert_id($conn);
    echo "New record created successfully. Last inserted ID is: " . $last_id;
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

mysqli_close($conn);
?>

Example 2: mysql get the last id php

// Insert query 
$query = "insert into users(username,fname,lname) values('sonarika','Sonarika','Bhadoria')"; 

mysqli_query($con,$query); 

// Get last insert id 
$lastid = mysqli_insert_id($con);

Example 3: mysql get this inserted id php

$this_id = mysqli_insert_id($db);