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 | $hostOptional − The host name running the database server. If not specified, then the default value will be localhost:3306. |
| 2 | $usernameOptional − The username accessing the database. If not specified, then the default will be the name of the user that owns the server process. |
| 3 | $passwdOptional − The password of the user accessing the database. If not specified, then the default will be an empty password. |
| 4 | $dbNameOptional − database name on which query is to be performed. |
| 5 | $portOptional − the port number to attempt to connect to the MySQL server.. |
| 6 | $socketOptional − 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.