Template Inheritance Demo

<?php namespace App\\Backend\\Core; class View { private string $viewsPath; private array $data = []; private array $sections = []; private ?string $extendedLayout = null; private array $sectionStack = []; private bool $minifyHTML = false; public function __construct(string $viewsPath = 'src/Frontend/Views') { $this->viewsPath = rtrim($viewsPath, '/'); } /** * Render a view with data */ public function render(string $view, array $data = [], ?bool $minify = null): string { $this->data = array_merge($this->data, $data); $this->minifyHTML = $minify ?? ($_ENV['MINIFY_HTML'] === 'true'); extract($this->data); ob_start(); try { $viewFile = $this->getViewPath($view); if (!file_exists($viewFile)) { throw new \\Exception("View file not found: {$viewFile}"); } include $viewFile; $content = ob_get_clean(); if ($this->extendedLayout) { $layoutContent = $this->renderLayout($this->extendedLayout, $data); return $this->minifyHTML ? $this->minifyHtml($layoutContent) : $layoutContent; } return $this->minifyHTML ? $this->minifyHtml($content) : $content; } catch (\\Exception $e) { ob_end_clean(); throw $e; } } /** * Template inheritance methods */ public function extend(string $layout): void { $this->extendedLayout = $layout; } public function section(string $name): void { $this->sectionStack[] = $name; ob_start(); } public function endSection(): void { if (empty($this->sectionStack)) { throw new \\Exception('No section to end'); } $sectionName = array_pop($this->sectionStack); $content = ob_get_clean(); if (isset($this->sections[$sectionName])) { $this->sections[$sectionName] .= $content; } else { $this->sections[$sectionName] = $content; } } public function yieldSection(string $name, string $default = ''): string { return $this->sections[$name] ?? $default; } }

<?php // Asset management with cache busting echo $this->asset('css/app.css'); // /assets/css/app.css?v=1640995200 echo $this->asset('js/app.js', false); // /assets/js/app.js (no versioning) // URL generation echo $this->url('/contact'); // http://localhost/contact echo $this->url('api/users'); // http://localhost/api/users // Security helpers echo $this->escape($userInput); // HTML-escaped content echo $this->csrfToken(); // CSRF token for forms // Text manipulation echo $this->truncate($longText, 150); // Truncated text with ... echo $this->truncate($text, 100, ' [more]'); // Custom suffix // Date formatting echo $this->formatDate($timestamp); // 2024-01-15 14:30:00 echo $this->formatDate($date, 'F j, Y'); // January 15, 2024 echo $this->formatDate($date, 'M d'); // Jan 15 // Component inclusion echo $this->component('user-card', [ 'user' => $user, 'showEmail' => true ]); // Partial views echo $this->include('partials.header', [ 'title' => 'Custom Header' ]); ?> <!-- Usage in templates --> <link rel="stylesheet" href="<?= $this->asset('css/app.css') ?>"> <form action="<?= $this->url('/submit') ?>" method="POST"> <input type="hidden" name="csrf_token" value="<?= $this->csrfToken() ?>"> <input type="text" name="comment" value="<?= $this->escape($oldInput['comment'] ?? '') ?>"> </form> <article> <h2><?= $this->escape($post['title']) ?></h2> <time><?= $this->formatDate($post['created_at'], 'F j, Y') ?></time> <p><?= $this->truncate($post['excerpt'], 200) ?></p> </article>

<?php // Conditional layout extension $layout = $user->isMobile() ? 'mobile' : 'desktop'; $this->extend($layout); // Dynamic section management $this->section('head'); if ($page->needsCustomCSS()) { echo '<link rel="stylesheet" href="' . $this->asset('css/custom.css') . '">'; } if ($page->needsAnalytics()) { echo '<script src="analytics.js"></script>'; } $this->endSection(); // Nested content sections $this->section('sidebar'); echo $this->component('widget', ['type' => 'recent-posts']); echo $this->component('widget', ['type' => 'categories']); // Conditional widgets based on user permissions if ($user->canSeeAdminWidget()) { echo $this->component('admin-widget'); } $this->endSection(); // Data-driven component rendering $this->section('content'); foreach ($pageBlocks as $block) { switch ($block['type']) { case 'text': echo $this->component('text-block', $block['data']); break; case 'image': echo $this->component('image-block', $block['data']); break; case 'gallery': echo $this->component('gallery', $block['data']); break; } } $this->endSection(); ?> <!-- Template with multiple conditional sections --> <?php $this->extend('main'); ?> <?php $this->section('title'); ?> <?= $this->escape($page['title']) ?> - <?= $_ENV['APP_NAME'] ?> <?php $this->endSection(); ?> <?php if (!empty($page['meta_description'])): ?> <?php $this->section('meta'); ?> <meta name="description" content="<?= $this->escape($page['meta_description']) ?>"> <?php $this->endSection(); ?> <?php endif; ?>