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Connecting to database showing error many time?

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This the content of my include file ("db_inc.php")

define("DATABASE", 'test');                         // default database name

function pdoConnect($dbname=DATABASE) 
    $db = new PDO("mysql:host=".HOST.";dbname=$dbname;charset=utf8",USERNAME,PASSWORD);
    $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
    return $db;

function myConnect($dbname=DATABASE)
    $db = mysqli_connect(HOST,USERNAME,PASSWORD,$dbname);
    return $db;

To use

include 'db_inc.php';

$conn = pdoConnect();                           // pdo connection to default database

or, for example, to connect a different database using mysqli

$conn = myConnect('sakila');

I recommend using PDO.

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