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<?php

  // Make an array as a constant for more security
  $db['db_host'] = 'localhost';
  $db['db_user'] = 'root';
  $db['db_pass'] = 'root';
  $db['db_name'] = 'my_database';
  
  // Loop through array
  foreach($db as $key => $value) {
    // Make into a constant (ex. Key: DB_HOST, Value: localhost)
    define(strtoupper($key), $value);
  }
  
  $connection = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
  
  if(!$connection) {
    echo "Connection error!";
  }

?>