PHP | mysqli_change_user() Function

PHP mysqli_change_user() Function


Hello folks! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP mysqli_change_user() Function.

The built-in PHP mysqli_change_user() function accepts a connection object, user name, password and, a database name as parameters, changes the user and database in the given connection object to the specified user and database.

Syntax

Following below is the syntax to use this function -

mysqli_change_user($con, $user, $password, $database);


Parameter Details

Sr.NoParameter & Description
1

con(Mandatory)

This is an object representing a connection to MySQL Server.

2

user(Optional)

This is a name of a MySQL user to which you need to change.

3

password(Optional)

This is a password of the specified MySQL user

3

database(Optional)

This represents the name of the database to which you need to change. If you pass NULL as a value to this parameter, this function just changes the user without selecting the database.


Return Value

This built-in PHP function returns a boolean value which is true if the database changed successfully and false if not.

PHP Version

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

Example1

The following below is an example which demonstrates the usage of PHP mysqli_change_user() function (in a procedural style) -

<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   $res = mysqli_change_user($con, "Webdesigntutorialz", "abc1234", "mydb");

   if($res){
      print("User changed successfully");
   }else{
      print("Sorry Couldn't change the user");
   }

   //Closing the connection
   mysqli_close($con);
?>

Output

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

User changed successfully

Example2

In an object oriented style the syntax of this function is $con->change_user(); Following is the example of this 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);

   $res = $con->change_user("Webdesigntutorialz", "abc1234", "mydb");

   if($res){
      print("User changed successfully");
   }else{
      print("Sorry couldn't change the user");
   }

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

?>

Output

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

User changed successfully

Example3

You can verify the database name after change as shown below -

//Creating a connection
$con = mysqli_connect("localhost", "root", "password", "mydb");

//Changing the database
$res = mysqli_change_user($con, "Webdesigntutorialz", "abc1234", "mydb");

$list = mysqli_query($con, "SELECT DATABASE()");

if($list) {
    $row = mysqli_fetch_row($list);
    print("Current Database: ". $row[0]);
}

//Closing the connection
mysqli_close($con);
?>

Output

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

Current Database: mydb

Example4

Try the following example below -

<?php
   $connection = mysqli_connect("localhost","root","password","mydb");
   
   if (mysqli_connect_errno($connection)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }   
   mysqli_change_user($connection, "myuser", "abc1234", "sampledb"); 
   mysqli_close($connection);
?>


Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the PHP mysqli_character_set_name() Function.

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