$conn or $con php
$servername = "localhost";
$username = "username";
$password = "password";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
Simplified
$conn = mysqli_connect('localhost', 'username', 'password');
$database = mysqli_select_db($conn, 'database');
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