high.php

<?php

if( isset( $_SESSION [ 'id' ] ) ) {
	// Get input
	$id = $_SESSION[ 'id' ];

	// Check database
	$query  = "SELECT first_name, last_name FROM users WHERE user_id = '$id' LIMIT 1;";
	$result = mysqli_query($GLOBALS["___mysqli_ston"], $query ) or die( '<pre>Something went wrong.</pre>' );

	// Get results
	while( $row = mysqli_fetch_assoc( $result ) ) {
		// Get values
		$first = $row["first_name"];
		$last  = $row["last_name"];

		// Feedback for end user
		$html .= "<pre>ID: {$id}<br />First name: {$first}<br />Surname: {$last}</pre>";
	}

	((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);		
}

?>