PROBLEM: Fatal error: Uncaught Error: Call to undefined function mysql_connect().
Probably the problem is that mysql_connect() function is not supported in PHP 7.
There are two alternatives: MySQLi and PDO.
<?php
$servername = "localhost";
$username = "your username";
$password = "your password";
$database = "databasename";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $database);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Database successfully connected";
mysqli_close($conn);
?>