PHP: SlimPHP PDO database connection

gistfile1.php

<?php
function getConnection() {
    
    $dbhost="127.0.0.1";
    
    switch(ENV){
        case 'dev':
            $dbuser="username";
            $dbpass="password";
            $dbname="databasename";
        break;
        case 'prod':
            $dbuser="username";
            $dbpass="password";
            $dbname="databasename";
        break;
    }

    $dbh = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    return $dbh;
}

?>