mysqli close() Method

The mysqli::close() / mysqli_close() function is used to close a previously opened database connection.

Open non-persistent MySQL connections and result sets are automatically closed when their objects are destroyed. Explicitly closing open connections and freeing result sets is optional. However, it is a good idea to close the connection as soon as the script finishes performing all of its database operations, if it still has a lot of processing to do after getting the results.

Syntax

//Object-oriented style
public mysqli::close()

//Procedural style
mysqli_close(mysql)

Parameters

No parameter is required.

Return Value

Returns true on success or false on failure.

Example: Object-oriented style

The example below shows the usage of mysqli::close() method.

<?php
//establishing connection to the database
$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_errno) {
  echo "Failed to connect to MySQL: ". $mysqli->connect_error;
  exit();
}

//getting query result from the database
$sql = "SELECT Name, Age FROM Employee ORDER BY Age";
$result = $mysqli->query($sql);

//closing the connection
$mysqli->close();

//processing the data retrieved from the database
//- fetching all result rows as associative array
$rows = $result->fetch_all(MYSQLI_ASSOC);

//displaying the rows
foreach ($rows as $row) {
  printf("%s, %d\n", $row["Name"], $row["Age"]);
}
?>

The output of the above code will be:

Marry, 23
Kim, 26
John, 27
Adam, 28

Example: Procedural style

The example below shows the usage of mysqli_close() function.

//establishing connection to the database
$mysqli = mysqli_connect("localhost", "user", "password", "database");
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: ". mysqli_connect_error();
  exit();
}

//getting query result from the database
$sql = "SELECT Name, Age FROM Employee ORDER BY Age";
$result = mysqli_query($mysqli, $sql);

//closing the connection
mysqli_close($mysqli);

//processing the data retrieved from the database
//- fetching all result rows as associative array
$rows = mysqli_fetch_all($result, MYSQLI_ASSOC);

//displaying the rows
foreach ($rows as $row) {
  printf("%s, %d\n", $row["Name"], $row["Age"]);
}
?>

The output of the above code will be:

Marry, 23
Kim, 26
John, 27
Adam, 28

❮ MySQLi Functions Reference