add php pdo code example

Example 1: how to connect pdo php database

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

try {
  $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  echo "Connected successfully";
} catch(PDOException $e) {
  echo "Connection failed: " . $e->getMessage();
}
?>

Example 2: php pdo

const DB_HOST = 'localhost';
const DB_NAME = 'DB_Name';			//Name of the database
const DB_USERNAME = 'username';		//Username to use
const DB_PASSWORD = 'Password';		//Password for that user


// Data Source Name
$dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME;

$options = [
    PDO::ATTR_EMULATE_PREPARES   => false, // turn off emulation mode for "real" prepared statements
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION, //turn on errors in the form of exceptions
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ, //make the default fetch be an anonymous object with column names as properties
];

//Create PDO instance
try {
    $pdo = new PDO($dsn, DB_USERNAME, DB_PASSWORD, $options);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}