Simple Way to connect database with mysql, MySQLi , pdo in php

Mysql database connection

$database_host = 'localhost'; // database host name
// if using port then add port $database_host = 'localhost:3036';  
$database_user = 'database_user'; // database user name
$database_pass = 'database_password'; // database user password

// connect with database
$database_conn = mysql_connect($database_host, $database_user, $database_pass);

// check database connection 
if(! $database_conn )
{
    // error in database connection
    die('Could not connect to database : ' . mysql_error()); 
} 
// connected to database
echo 'Connected successfully with database'; 

// close connection with Mysql database
mysql_close($database_conn);  

MySQLi Object-Oriented database connection

$database_host = 'localhost'; // database host name
// if using port then add port $database_host = 'localhost:3036';  
$database_user = 'database_user'; // database user name
$database_pass = 'database_password'; // database user password

// connect with database
$database_conn = new mysqli($database_host, $database_user, $database_pass);

// check database connection 
if ($database_conn->connect_error) 
{   
    // error in database connection
    die("Could not connect to database : " . $database_conn->connect_error);
} 

// connected to database
echo 'Connected successfully with database';

// close connection with MySQLi database
$database_conn->close();

MySQLi Procedural database connection

$database_host = 'localhost'; // database host name
// if using port then add port $database_host = 'localhost:3036';  
$database_user = 'database_user'; // database user name
$database_pass = 'database_password'; // database user password

// connect with database
$database_conn = mysqli_connect($database_host, $database_user, $database_pass);

// check database connection 
if (!$database_conn) 
{
    // error in database connection
    die("Could not connect to database : " . mysqli_connect_error());
}

// connected to database
echo 'Connected successfully with database';

// close connection with MySQLi Procedural
mysqli_close($database_conn);

PDO database connection

$database_host = 'localhost'; // database host name    
$database_user = 'database_user'; // database user name
$database_pass = 'database_password'; // database user password
$database_name = 'your_database_name'; // database name

try
{
    $database_conn = new PDO("mysql:host=$database_host;dbname=$database_name", $database_user, $database_pass);
    // if using port then use port id in PDO  
    //$database_conn = new PDO('mysql:host=$database_host;port=5432;dbname=$database_name', $database_user, $database_pass);
     
    // exception for PDO connection error
    $database_conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
     
    // connected to database
    echo 'Connected successfully with database';
}
catch(PDOException $exception)
{
    // error in database connection
    echo "Could not connect to database : " . $exception->getMessage(); // exception
}

// close connection with PDO
$database_conn = null; 

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