PHP

php pdo connection

$host     = "localhost";//Ip of database, in this case my host machine    
$user     = "root";	//Username to use
$pass     = "qwerty";//Password for that user
$dbname   = "DB";//Name of the database

try {
    $connection = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
    $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

}catch(PDOException $e)
{
  echo $e->getMessage();                         
}

PDO connect

<?php
$db = new PDO('mysql:host=myhost;dbname=mydb', 'login', 'password');

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();
    }

pdo connection

<?php
$servername = "localhost";
$username = "root";
$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();
}
?>

php how to connect to db using PDO

<?php 
  $db_src    = "mysql:host=localhost;dbname=databasename";
  $db_user   = "root";
  $db_pass   = "";
  try{
    $connect = new PDO($db_src, $db_user, $db_pass);
    $connect->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  }
  catch(PDOEXCEPTION $err){
    echo "Failed To Connect. Error " . $err->getMessage();
  }
/* Variable $connect will be used to execute DB Statements*/

php pdo sql server connect

$db = new PDO("sqlsrv:Server=YouAddress;Database=YourDatabase", "Username", "Password");

pdo connection

//In this PHP DATA OBJECT (PDO) CONNECTION I am gonna use 
//the exception code that will help hide your database login 
//details from your users if there is an exception (error).
 //dbname(database name)
 //charset(characters encoding )

  try {
    $pdo = new PDO('mysql:host=localhost;dbname=joke;charset=utf8','username','password');
    $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
  echo 'Successfully Connected to the database';
  } catch (PDOException $e) {
    echo 'ErrorException'.$e->getMessage().'in'.$e->getFile().$e->getCode().$e->getLine();
  } 

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();
}

php pdo example

$host = '127.0.0.1';
$db   = 'test';
$user = 'root';
$pass = '';
$charset = 'utf8mb4';
$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
  			PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES   => false,];
try {
	$pdo = new PDO($dsn, $user, $pass, $options);
} catch (PDOException $e) {
    throw new PDOException($e->getMessage(), (int)$e->getCode());
}

PHP PDO connection code | PHP PDO config file

<?php
define('DBNAME','tute');
define('DBUSER','root');
define('DBPASS','');
define('DBHOST','localhost');
try {
  $db = new PDO("mysql:host=".DBHOST.";dbname=".DBNAME, DBUSER, DBPASS);
  $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  //echo "Your page is connected with database successfully..";
} catch(PDOException $e) {
  echo "Issue -> Connection failed: " . $e->getMessage();
}
?>

database connection in pdo php

$connect = new PDO("mysql:host=$host;dbname=$db", $user, $pass, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));