124 lines
3.7 KiB
PHP
124 lines
3.7 KiB
PHP
<?php
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/**
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* Plugin Name: Ruady OG Head
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* Description: Generates Open Graph tags for Social Media sharing (Facebook, Twitter/X, etc.)
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* Version: 0.1.0
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* Author: David Madl
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*/
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// note: install by copying into wp-content/plugins/ruady-og-head/ruady-og-head.php
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declare(strict_types=1);
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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final class Ruady_OG_Head {
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public static function init(): void {
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add_action( 'wp_head', [ __CLASS__, 'render_head_markup' ], 20 );
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}
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/**
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* Echo markup into <head> for the currently displayed singular object.
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*/
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public static function render_head_markup(): void {
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// Adjust this if you only want standard posts:
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// if ( ! is_singular( 'post' ) ) { return; }
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if ( ! is_singular() ) {
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return;
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}
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$post_id = get_queried_object_id();
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if ( ! $post_id ) {
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return;
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}
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$post = get_post( $post_id );
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if ( ! $post instanceof WP_Post ) {
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return;
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}
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if ( ! has_category( 'Kurzgeschichten', $post_id ) ) {
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return;
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}
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$html = self::build_markup_for_post( $post );
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if ( $html === '' ) {
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return;
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}
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echo "\n" . $html . "\n";
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}
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private static function make_description( string $text ): string {
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$target_length = 150;
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$parts = explode(' ', $text);
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$lengths = array_map('strlen', $parts);
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$total_length = 0;
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$i = 0;
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for ( ; $i < count($lengths); $i++ ) {
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if ( $total_length + $lengths[$i] > $target_length ) break;
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$total_length += $lengths[$i];
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}
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$desc = implode(' ', array_slice($parts, 0, $i));
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$ellipsis = substr($desc, -1, 1) == '.' ? '' : ' ...'; // full sentences with a '.' don't need ellipsis '...'
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return $desc . $ellipsis;
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}
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/**
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* Build the head markup for one post.
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*/
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private static function build_markup_for_post( WP_Post $post ): string {
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// Example 1: conditionally emit markup only for a specific post type.
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if ( $post->post_type !== 'post' ) {
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return '';
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}
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$post_url = get_permalink( $post );
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$post_title = get_the_title( $post );
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$excerpt = get_the_excerpt( $post );
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$site_title = get_bloginfo( 'name' );
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$site_url = site_url();
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$site_url_p = parse_url($site_url);
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$site_host = $site_url_p['host'];
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$description = self::make_description(wp_strip_all_tags( $excerpt ));
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// Example business logic:
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// - add a meta tag for every post
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// - add JSON-LD only if the post is in category "news"
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$is_news = has_category( 'news', $post );
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ob_start();
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?>
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<meta name="description" content="<?php echo esc_attr( $description ); ?>">
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<!-- Open Graph Meta Tags -->
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<meta property="og:url" content="<?php echo esc_url( $site_url ); ?>">
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<meta property="og:type" content="website">
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<meta property="og:title" content="<?php echo esc_attr( $post_title ); ?> – <?php echo esc_attr( $site_title ); ?>">
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<meta property="og:description" content="<?php echo esc_attr( $description ); ?>">
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<!--<meta property="og:image" content="">--><!-- Load error, please check URL -->
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<!-- Twitter Meta Tags -->
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<meta name="twitter:card" content="summary_large_image">
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<meta property="twitter:domain" content="<?php echo esc_attr( $site_host ); ?>">
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<meta property="twitter:url" content="<?php echo esc_url( $site_url ); ?>">
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<meta name="twitter:title" content="<?php echo esc_attr( $post_title ); ?> – <?php echo esc_attr( $site_title ); ?>">
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<meta name="twitter:description" content="<?php echo esc_attr( $description ); ?>">
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<!--<meta name="twitter:image" content="">-->
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<!-- Per-Post Head HTML plugin -->
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<meta name="x-post-id" content="<?php echo esc_attr( (string) $post->ID ); ?>">
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<meta name="x-post-type" content="<?php echo esc_attr( $post->post_type ); ?>">
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<link rel="canonical" href="<?php echo esc_url( $post_url ); ?>">
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<?php
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return trim( (string) ob_get_clean() );
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}
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}
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Ruady_OG_Head::init();
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