PHP | mysqli_close() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP mysqli_close() Function.

The PHP mysqli_close() function accepts a MYSQL function object (formerly opened) as a parameter, and closes it.

You cannot close persistent connections using this function.

Syntax

Following below is the syntax to use this function -

mysqli_close($con);

READ: PHP | mysqli_change_user() Function

Parameter Details

Sr.No	Parameter & Description
1	con(Mandatory) This is an object representing a connection to MySQL Server that you need to close.

Return Value

This built-in PHP function returns TRUE on success and FALSE on failure.

PHP Version

This built-in function was first introduced in PHP version 5 and it works in all of the later versions.

Example1

The following example demonstrates the usage of the PHP mysqli_close() function (in a procedural style) -

<?php
   $host = "localhost";
   $username  = "root";
   $passwd = "password";
   $dbname = "mydb";

   //Creating a connection
   $con = mysqli_connect($host, $username, $passwd, $dbname);

   //Closing the connection
   $res = mysqli_close($con);

   if($res){
      print("Connection Closed");
   }else{
      print("There is an issue while closing the connection");
   }
?>

Output

When the above code is executed, it will produce the following result -

Connection Closed

Example2

In an object oriented style the syntax of this PHP function is $con->close(), Following is the usage of this PHP function in an object oriented style minus;

<?php
   $host = "localhost";
   $username  = "root";
   $passwd = "password";
   $dbname = "mydb";

   //Creating a connection
   $con = new mysqli($host, $username, $passwd, $dbname);

   //Closing the connection
   $res = $con -> close();

   if($res){
      print("Connection Closed");
   }else{
      print("There is an issue while closing the connection");
   }
?>

Output

When the above code is executed, it will produce the following result -

Connection Closed

Example3

This is another example of the built-in PHP mysqli_close() function -

<?php
   //Creating a connection
   $con = @mysqli_connect("localhost");
   $res = @mysqli_close($con);

   if($res){
      print("Connection closed Successfully");
   }else{
      print("Sorry there is an issue could close the connection ");
   }
?>

Output

When the above code is executed, it will produce the following result -

Sorry there is an issue could close the connection

Example4

Try the following example below -

<?php
   $connection = @mysqli_connect("webdesigntutorialz.com", "use", "pass", "my_db");
   
   if (mysqli_connect_errno($connection)){
      echo "Failed to connect to MySQL: ".mysqli_connect_error();
   }else{
	   mysqli_close($connection);
   }   
?>

Output

When the above code is executed, it will produce the following result -

Failed to connect to MySQL: No connection could be made because the target machine actively refused it.

READ: PHP | mysqli_character_set_name() Function

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the PHP mysqli_commit() Function.

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