'; // WebP source $picture .= ''; // Original format source $picture .= ''; // Fallback img $picture .= ''; $picture .= ''; return $picture; } /** * Add critical image loading for above-the-fold images */ public static function generateCriticalImageAttrs(string $src, string $alt = '', array $sizes = []): string { $attrs = []; // No lazy loading for critical images $attrs[] = 'src="' . htmlspecialchars($src) . '"'; $attrs[] = 'loading="eager"'; $attrs[] = 'fetchpriority="high"'; $attrs[] = 'decoding="sync"'; // Alt text if ($alt) { $attrs[] = 'alt="' . htmlspecialchars($alt) . '"'; } // Responsive sizes if (!empty($sizes)) { $srcset = self::generateSrcset($src, $sizes); $attrs[] = 'srcset="' . $srcset . '"'; $attrs[] = 'sizes="100vw"'; } return implode(' ', $attrs); } }