PHP provides mysqli_connect() function to open a database connection. This function takes six parameters and returns the successful connection as an object. If the connection failed to establish, then the function returns the boolean value False.
Example :-
$con = new mysqli($host, $username, $passwd, $dbname);
You can disconnect from the MySQLi database using the MySQLi close function.
Statement to close connetion :-
$con -> close();
PHP example of connecting to a MySQLi server –
<html>
<head>
<title>Connecting to MySQLi Server</title>
</head>
<body>
<?php
$host = "localhost";
$username = "root";
$password = "password";
$dbname = "mydb";
$con = new mysqli($host, $username, $password, $dbname);
if($con->connect_errno){
print("Connection not established. ");
}else{
print("Connection Established Successfully");
}
$con -> close();
?>
</body>
</html>