What is the Database Connection Code? Please help Thank you

<?php error_reporting(E_ALL); define('DBHOST', 'localhost'); define('DBUSER', 'id000001_username'); define('DBPASS', '*********************'); define('DBNAME', 'id000001_dbname'); $conn = mysqli_connect(DBHOST,DBUSER,DBPASS); // i have this error $dbcon = mysql_select_db(DBNAME); if ( !$conn ) { die("Connection failed : " . mysql_error()); } if ( !$dbcon ) { die("Database Connection failed : " . mysql_error()); } ?>

Fatal error : Uncaught Error: Call to undefined function mysql_select_db() in /storage/ssd3/346/11352346/public_html/secretary/dbconnect.php:13 Stack trace: #0 /storage/ssd3/346/11352346/public_html/secretary/index.php(5): require_once() #1 {main} thrown in /storage/ssd3/346/11352346/public_html/secretary/dbconnect.php on line 13

PDO would be best

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