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add_action('wp_head', function() {

    global $post;

    if(is_single() || is_page()) {

        $image = get_field('share_image', get_option('page_on_front'));;
        ?>

        <meta property="og:title" content="<?php echo get_field('share_title', get_option('page_on_front')); ?>"/>
        <meta property="og:description" content="<?php echo get_field('share_description', get_option('page_on_front'));  ?>"/>
        <meta property="og:type" content="article"/>
        <meta property="og:url" content="<?php echo the_permalink(); ?>"/>
        <meta property="og:site_name" content="<?php echo get_bloginfo(); ?>"/>
        <meta property="og:image" content="<?php echo $image['url']; ?>"/>

        <?php
    } else {
        return;
    }

}, 5);

        window.open(
            'https://www.facebook.com/sharer/sharer.php?u='+encodeURIComponent(location.href),
            'facebook-share-dialog',
            'width=600,height=400,scrollbars=no');