chiro-canto/public/home/status.php

<?php
$root = realpath($_SERVER["DOCUMENT_ROOT"]);
require "$root/database/credentials.php";

// Connect the database
try {
	$db = new PDO("mysql:host=$host;dbname=$database;charset=utf8", 
		$user, 
		$password, 
		array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
		));
} catch (Exception $e) {
	die("Error : ".$e->getMessage());
}

$req = $db->prepare('SELECT COUNT(*) AS counter FROM `records`');
$req->execute();
if ($data = $req->fetch()) {
    $record_counter = $data['counter'];
}
$req = $db->prepare('SELECT COUNT(*) AS counter FROM `authors`');
$req->execute();

if ($data = $req->fetch()) {
    $user_counter = $data['counter'];
}
$req = $db->prepare('SELECT COUNT(*) AS counter FROM `taxa`');
$req->execute();

if ($data = $req->fetch()) {
    $taxa_counter = $data['counter'];
}
?>
<div id="status">
    <?=$record_counter?> Records Uploaded<br>
	<?=$user_counter?> Users Registered<br>
	<?=$taxa_counter?> Taxa Available<br>

	<?php 
	$bytes = disk_free_space ("$root/storage/records");
	$si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );
    $base = 1024;
    $class = min((int)log($bytes , $base) , count($si_prefix) - 1);
    echo sprintf('%1.2f', $bytes / pow($base,$class)).' '.$si_prefix[$class];?> of Free space <br> 
</div>