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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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