PHP PDO mysql access

file.php

<?php
    $db = new PDO('mysql:host=localhost;dbname=your_database_name', 'your_username', 'your_password');
    $query = "INSERT INTO clients (name, email, phone) VALUES (:name, :email, :phone)";
    $stmt = $db->prepare($query);
    $stmt->bindValue(':name', $args['input']['name']);
    $stmt->bindValue(':email', $args['input']['email']);
    $stmt->bindValue(':phone', $args['input']['phone']);
    $stmt->execute();
    $clientId = $db->lastInsertId();
    $query = "SELECT * FROM clients WHERE id = :id";
    $stmt = $db->prepare($query);
    $stmt->bindValue(':id', $clientId);
    $stmt->execute();
    $client = $stmt->fetch(PDO::FETCH_ASSOC);
    return $client;