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Opening a mySQL database connection

SOURCE CODE:

 <?php

 $servername="localhost";
$username="root";
$password="";

 //Create a connection
   $connect=mysqli_connect("$servername","$username","$password");

 //Check the connection

 if (mysqli_connect_error()){
   die("Database connection failed:ERROR: ".mysqli_connect_error();
}
else{
  echo "Database connected successfully!";
?>

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