Ty Clifford
88 lines
2.3 KiB
PHP
88 lines
2.3 KiB
PHP
<?php
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class pluginCanonical extends Plugin {
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public function siteHead()
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{
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global $url;
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global $page;
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global $WHERE_AM_I;
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$html = '';
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$canonical = '';
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switch ($WHERE_AM_I) {
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case 'home':
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// Handle pagination on homepage
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$pageNumber = $url->pageNumber();
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if ($pageNumber > 1) {
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$canonical = DOMAIN_BASE . 'page/' . $pageNumber . '/';
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} else {
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$canonical = DOMAIN_BASE;
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}
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break;
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case 'page':
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$canonical = $page->permalink($absolute = true);
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break;
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case 'category':
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// Category pages
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$categoryKey = $url->slug();
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$canonical = DOMAIN_CATEGORIES . $categoryKey . '/';
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$pageNumber = $url->pageNumber();
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if ($pageNumber > 1) {
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$canonical .= 'page/' . $pageNumber . '/';
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}
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break;
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case 'tag':
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// Tag pages
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$tagKey = $url->slug();
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$canonical = DOMAIN_TAGS . $tagKey . '/';
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$pageNumber = $url->pageNumber();
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if ($pageNumber > 1) {
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$canonical .= 'page/' . $pageNumber . '/';
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}
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break;
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default:
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// For any other page type, use current URI
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$canonical = DOMAIN_BASE . ltrim($url->uri(), '/');
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break;
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}
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if (!empty($canonical)) {
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$html .= '<link rel="canonical" href="' . htmlspecialchars($canonical, ENT_QUOTES, 'UTF-8') . '">' . PHP_EOL;
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// Add prev/next for paginated content (helps search engines)
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$pageNumber = $url->pageNumber();
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if ($pageNumber > 1) {
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// Previous page
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if ($pageNumber === 2) {
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$prevUrl = preg_replace('/page\/\d+\/?$/', '', $canonical);
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} else {
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$prevUrl = preg_replace('/page\/\d+\/?$/', 'page/' . ($pageNumber - 1) . '/', $canonical);
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}
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$html .= '<link rel="prev" href="' . htmlspecialchars($prevUrl, ENT_QUOTES, 'UTF-8') . '">' . PHP_EOL;
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}
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// Next page (only if more content exists)
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// This requires checking if there's a next page of content
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global $content;
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global $site;
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if (isset($content) && is_array($content) && count($content) >= $site->itemsPerPage()) {
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$nextUrl = preg_replace('/page\/\d+\/?$/', '', $canonical);
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if ($pageNumber < 1) {
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$nextUrl .= 'page/2/';
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} else {
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$nextUrl = preg_replace('/page\/\d+\/?$/', 'page/' . ($pageNumber + 1) . '/', $canonical);
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}
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$html .= '<link rel="next" href="' . htmlspecialchars($nextUrl, ENT_QUOTES, 'UTF-8') . '">' . PHP_EOL;
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}
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}
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return $html;
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}
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}
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