meta-description-spengler

functions.php

function add_custom_meta_description() {
	global $post;
	$current_post   = $post->ID;
	$excerpt        = get_the_excerpt( $current_post );
	$cf_description = get_post_meta( $current_post, "description", true );

	$output = 0;

	if ( ! empty( $cf_description ) ) {
		$output = $cf_description;
	} elseif ( ! empty( $excerpt ) ) {
		$output = $excerpt;
	}

	if ( ! empty( $output ) ) { ?>
        <meta name="description" content="<?php echo $output ?>">
	<?php }
}

add_action( 'wp_head', 'add_custom_meta_description', 1 );