<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");

// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

// Check if server is alive
if (mysqli_ping($con))
{
echo "Connection is ok!";
}
else
{
echo "Error: ". mysqli_error($con);
}

mysqli_close($con);
?>