[PHP] Système de blague du jour

<?php
$pdo = new PDO('mysql:host=localhost;dbname=db_test','root','');

$lastUpdateUrl = 'last_update.txt';
$currentIdUrl = 'current_id.txt';

$lastUpdateFile = fopen($lastUpdateUrl,'r+');
$lastUpdateTimestamp = fgets($lastUpdateFile);
if($lastUpdateTimestamp < ($_SERVER['REQUEST_TIME'] - (3600 * 24))) {
	fseek($lastUpdateFile, 0);
	fputs($lastUpdateFile, $_SERVER['REQUEST_TIME']);
	
	$sql = 'SELECT id FROM 'blagues' ORDER BY RAND() LIMIT 0,1';
	$req = $pdo->query($sql);
	$row = $req->fetch();
	$id = $row['id'];
	
	$currentIdFile = fopen($currentIdUrl, 'r+');
	fputs($currentIdFile, $id);
	fclose($currentIdFile);
}
fclose($lastUpdateFile);
?>