PHP | mysqli_close() Function
Last Updated :
13 May, 2019
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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:
PHP
MySQLi Object-oriented procedure::
To close the connection in mysql database we use php function conn->close() which disconnect from database.
Syntax:
PHP
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:
PHP
References: http://php.net/manual/en/mysqli.close.php
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);
?>
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();
?>
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;
?>
