PHP & MySQL - Connect Database Example

PHP provides mysqli contruct or mysqli_connect() function to open a database connection. This function takes six parameters and returns a MySQL link identifier on success or FALSE on failure.

Syntax

$mysqli = new mysqli($host, $username, $passwd, $dbName, $port, $socket);

Sr.No. Parameter & Description
1

$host

Optional − The host name running the database server. If not specified, then the default value will be localhost:3306.
2

$username

Optional − The username accessing the database. If not specified, then the default will be the name of the user that owns the server process.
3

$passwd

Optional − The password of the user accessing the database. If not specified, then the default will be an empty password.
4

$dbName

Optional − database name on which query is to be performed.
5

$port

Optional − the port number to attempt to connect to the MySQL server..
6

$socket

Optional − socket or named pipe that should be used.

You can disconnect from the MySQL database anytime using another PHP function close().

Syntax

$mysqli->close();

Example

Try the following example to connect to a MySQL server −

Copy and paste the following example as mysql_example.php −

<html>
   <head>
      <title>Connecting MySQL Server</title>
   </head>
   <body>
      <?php
         $dbhost = 'localhost';
         $dbuser = 'root';
         $dbpass = 'root@123';
         $mysqli = new mysqli($dbhost, $dbuser, $dbpass);
         
         if($mysqli->connect_errno ) {
            printf("Connect failed: %s<br />", $mysqli->connect_error);
            exit();
         }
         printf('Connected successfully.<br />');
         $mysqli->close();
      ?>
   </body>
</html>

Output

Access the mysql_example.php deployed on apache web server and verify the output.

Connected successfully.
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