create PHP file to establish db connection using PDO code example

Example 1: database connection in php pdo

<?php
class database{
  private $host = "localhost";
  private $db_name = "php_basic";
  private $username = "root";
  private $password = "";
  private $conn;

  // connect database using PDO
  function connect_pdo(){
    try{
      $this->conn = new PDO("mysql:host=".$this->host.";dbname=".$this->db_name, $this->username, $this->password);
      return $this->conn;
    }
    catch(PDOException $ex){
      echo "Connection Error -->> ",$ex->getMessage();
      echo "<br>Error Code -->> ",$ex->getCode();
      echo "<br>Error occur in File -->> ",$ex->getFile();
      echo "<br>Error occur on Line no -->> ",$ex->getLine();

      $this->conn = null; // close connection in PDO
    }
  }
}
?>
  
//how to use 
<?php
include 'connect_db.php';
$database=new database();
$db = $database->connect_pdo();
?>

Example 2: php PDO database connection

$hostName = "localhost";
$dbName = "test";
$userName = "test";
$password = "test1";
try {
    $pdo = new PDO("mysql:host=$hostName;dbname=$dbName",$userName,$password);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "Connected successfully"; 
    }
    catch(PDOException $e)
    {
     echo "Connection failed: " . $e->getMessage();
    }