Which of the following method can be used to close a mysql database using php?

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MySQLi Procedural procedure:
To close the connection in mysql database we use php function mysqli_close() which disconnect from database. It require a parameter which is a connection returned by the mysql_connect function.

Syntax:

mysqli_close(conn);

If the parameter is not specified in mysqli_close() function, then the last opened database is closed. This function returns true if it closes the connection successfully otherwise it returns false.

Below program illustrate the mysqli_close() function

$servername = "localhost";

$username = "username";

$password = "password";

$conn = mysqli_connect($servername, $username, $password);

if (!$conn) {

    die("Connection failed: " . mysqli_connect_error());

}

$sql = "CREATE DATABASE newDB";

if (mysqli_query($conn, $sql)) {

    echo "Database created successfully with the name newDB";

} else {

    echo "Error creating database: " . mysqli_error($conn);

}

mysqli_close($conn);

?>

MySQLi Object-oriented procedure::

To close the connection in mysql database we use php function conn->close() which disconnect from database.

Syntax:

conn->close();

Program: To illustrate the closing of connection in object-oriented procedure.

$servername = "localhost";

$username = "username";

$password = "password";

$dbname = "newDB";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {

    die("Connection failed: " . $conn->connect_error);

}

$conn->close();

?>

Using PDO procedure:
To close the connection in MySQL database in PDO procedure we set the connection name to null which disconnect from the database.

Syntax:

conn=null;

Program: to illustrate the closing of connection in PDO procedure.

$servername = "localhost";

$username = "username";

$password = "password";

try {

    $conn = new PDO("mysql:host=$servername;dbname=newDB", 

                     $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $sql = "CREATE DATABASE newDB";

    $conn->exec($sql);

    echo "Database created successfully with the name newDB";

    }

catch(PDOException $e)

    {

    echo $sql . "

" . $e->getMessage();

    }

$conn = null;

?>

References: http://php.net/manual/en/mysqli.close.php