tag. */ $jsFile = __DIR__ . '/inventory-data.js'; $lockFile = __DIR__ . '/sync.lock'; $maxAge = 6 * 3600; // 6 hours // Output the pixel first (non-blocking for page load) header('Content-Type: image/gif'); header('Cache-Control: no-cache, no-store, must-revalidate'); echo base64_decode('R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'); // Flush output so the page doesn't wait if (function_exists('fastcgi_finish_request')) { fastcgi_finish_request(); } else { @ob_end_flush(); @flush(); } // Now do the sync check (after response sent) try { // Quick check: is inventory-data.js fresh enough? if (file_exists($jsFile) && (time() - filemtime($jsFile)) < $maxAge) { exit; // Fresh, skip } // Find newest CSV $csvFiles = glob(__DIR__ . '/DealerCenter_*.csv'); if (!$csvFiles) exit; usort($csvFiles, function($a, $b) { return filemtime($b) - filemtime($a); }); $latestCsv = $csvFiles[0]; // If JS is newer than latest CSV, skip if (file_exists($jsFile) && filemtime($jsFile) >= filemtime($latestCsv)) exit; // Prevent concurrent rebuilds (lock expires after 5 min) if (file_exists($lockFile) && (time() - filemtime($lockFile)) < 300) exit; file_put_contents($lockFile, date('c')); // Trigger sync by hitting the cron endpoint internally $ctx = stream_context_create(['http' => ['timeout' => 30]]); @file_get_contents('https://yellowgreen-emu-225498.hostingersite.com/cron-sync.php?key=carucars-sync-2026-x9f4', false, $ctx); @unlink($lockFile); } catch (Throwable $e) { @unlink($lockFile); @file_put_contents(__DIR__ . '/sync-log.txt', '[' . date('Y-m-d H:i:s') . '] check-sync error: ' . $e->getMessage() . "\n", FILE_APPEND | LOCK_EX ); }