Show meta information in WP using ACF

header.php

<title><?php showMeta('title');?></title>
<meta name="description" content="<?php showMeta('description');?>">

showMeta.php

<? 
/* First, create ACF fields with slugs 'meta_title', 'meta_description' for posts, pages and categories */

function showMeta($meta) {    
    $stringAfter = ' | Центр эстетической медицины ШайнЭст';
    $titleForFrontPage = 'Центр эстетической медицины ШайнЭст';
    if ( is_tax() ) {
		$term_slug = get_query_var( 'term' );
		$taxonomy = get_query_var( 'taxonomy' );
		$term = get_term_by( 'slug', $term_slug, $taxonomy);        
        $term_id_str = $taxonomy . '_' . $term->term_id; 
        $meta_title = get_field('meta_title', $term_id_str);
        $meta_description = get_field('meta_description', $term_id_str);
    } else {    

        $meta_title = get_field('meta_title');
        $meta_description = get_field('meta_description');

    }
    $defaultTitle = wp_title('', false);
    if ($meta == "title") {
        if ( $meta_title ) {
            $resultTitle = $meta_title . $stringAfter;    
        } else if ( is_front_page() ) {
            $resultTitle = $titleForFrontPage;
        } else {
            $substr = substr($defaultTitle, 2);
            $resultTitle = $substr . $stringAfter;
        }
        echo $resultTitle;
    }

    if ($meta == "description") {
        if ( $meta_description ) {
            $resultDesc = $meta_description;
        } else {
            $substr = substr($defaultTitle, 2);
            $resultDesc = $substr;
        }
        echo $resultDesc;
    }
}
?>