thz_opengraph

thz_opengraph.php

<?php


function thz_opengraph() {
    
    if (defined('WPSEO_VERSION')) {
        // if Yoast
        if (get_post_type() == 'docs') {
			
            $og_img = 'CUSTOM IMAGE IF DOCS';
            $og     = '<meta property="og:image" content="' . $og_img . '"/>';
            echo $og;
        }
        
    } else {
        
        global $post;
        
        if (get_post_type() == 'docs') {
            
            $og_img = 'CUSTOM IMAGE IF DOCS';
            
        } else {
            
			// default og_img
            $og_img = get_stylesheet_directory_uri() . '/admin-splash.jpg';
            
            if ( has_post_thumbnail($post->ID) ) {
                $img_src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'large');
                $og_img  = isset($img_src[0]) ? $img_src[0] : $og_img;
            }
        }
        
        if ( is_front_page() ) {
            
            $excerpt = 'CUSTOM EXCERPT IF FRONTPAGE';
            
        } else {
            
            $excerpt = $post->post_excerpt;
            
            if ($excerpt != '') {
                $excerpt = strip_tags($post->post_excerpt);
                $excerpt = str_replace("", "'", $excerpt);
            } else {
                $excerpt = get_bloginfo('description');
            }
            
        }
        
        $type = is_front_page() ? 'website' : 'article';
        
        $og = '<meta property="og:title" content="' . get_the_title() . '"/>';
        $og .= '<meta property="og:description" content="' . $excerpt . '"/>';
        $og .= '<meta property="og:type" content="' . $type . '"/>';
        $og .= '<meta property="og:url" content="' . get_the_permalink() . '"/>';
        $og .= '<meta property="og:site_name" content="YOUR_DOMAIN_NAME"/>';
        $og .= '<meta property="og:image" content="' . $og_img . '"/>';
        
        echo $og;
        
    }
    
}

add_action('wp_head', 'thz_opengraph', 5);