//-----------------------------------------
// Im Header die meta-Daten festlegen
//-----------------------------------------
function elseo_header() {
    // Post holen
    global $post;
    $post_id         = $post->ID;
    $post_author_id = get_post_field('post_author', $post_id);    
    
    //------------------------------------------------------------------
    // Meta-Titel
    //------------------------------------------------------------------
    if( get_post_meta( get_the_ID(), 'meta_titel', true ) ) {
        if ( get_post_meta( get_the_ID(), 'meta_titel', true) !="" ){
            remove_action( 'wp_head', '_wp_render_title_tag', 1 ); // Titel-Tag entfernen, wenn vorhanden, damit nicht doppelt
            echo '<title>'.html_entity_decode(esc_attr(get_post_meta( get_the_ID(), 'meta_titel', true))).'</title>'."
";    
            echo '<meta property="og:title" content="'.get_post_meta( get_the_ID(), 'meta_titel', true).'">'."
";
            echo '<meta name="twitter:title" content="'.get_post_meta( get_the_ID(), 'meta_titel', true).'">'."
";
        }
    }else{
        echo '<meta property="og:title" content="'.get_the_title().'">';
        echo '<meta name="twitter:title" content="'.get_the_title().'">';
    }
    //------------------------------------------------------------------
    // Meta-Description
    //------------------------------------------------------------------
    if( get_post_meta( get_the_ID(), 'meta_beschreibung', true ) ) {
        if ( get_post_meta( get_the_ID(), 'meta_beschreibung', true) !="" ){
            echo '<meta name="description" content="'.html_entity_decode(esc_attr(get_post_meta( get_the_ID(), 'meta_beschreibung',true))).'" >'."
";
            echo '<meta property="og:description" content="'.html_entity_decode(esc_attr(get_post_meta( get_the_ID(), 'meta_beschreibung',true))).'">'."
";
            echo '<meta name="twitter:description" content="'.html_entity_decode(esc_attr(get_post_meta( get_the_ID(), 'meta_beschreibung',true))).'">'."
";
        }
    }
    
}
add_action('wp_head', 'elseo_header',-1000);
?>