PHP | mysqli_close() Function

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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

<?php 
$servername = "localhost"; 
$username = "username"; 
$password = "password"; 
  
// Creating connection 
$conn = mysqli_connect($servername, $username, $password); 
  
// Checking connection 
if (!$conn) { 
    die("Connection failed: " . mysqli_connect_error()); 
} 
  
// Creating a database named newDB 
$sql = "CREATE DATABASE newDB"; 
if (mysqli_query($conn, $sql)) { 
    echo "Database created successfully with the name newDB"; 
} else { 
    echo "Error creating database: " . mysqli_error($conn); 
} 
  
// closing connection 
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.

<?php 
$servername = "localhost"; 
$username = "username"; 
$password = "password"; 
$dbname = "newDB"; 
  
// checking connection 
$conn = new mysqli($servername, $username, $password, $dbname); 
  
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 
//Close the connection 
$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.

<?php 
$servername = "localhost"; 
$username = "username"; 
$password = "password"; 
  
try { 
    $conn = new PDO("mysql:host=$servername;dbname=newDB",  
                     $username, $password); 
  
    // setting the PDO error mode to exception 
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
  
    $sql = "CREATE DATABASE newDB"; 
  
    // using exec() because no results are returned 
    $conn->exec($sql); 
  
    echo "Database created successfully with the name newDB"; 
    } 
catch(PDOException $e) 
    { 
    echo $sql . " 
" . $e->getMessage(); 
    } 
$conn = null; 
?> 