Meta Tags in WordPress – Joseph Limpot

<meta name="description" content="<?php if ( is_single() ) {
        single_post_title('', true); 
    } else {
        bloginfo('name'); echo " - "; bloginfo('description');
    }
    ?>" />

<?php if ( is_home() ) { ?>
<meta name="description" content="Freelance Web Design and Development Service"/>
 <?php } ?> 
 <?php if ( is_single() OR is_page() ) { ?>
<meta name="description" content="<?php { setup_postdata($post); echo strip_tags( strip_shortcodes((get_the_excerpt()))); } ?>"/>
 <?php } ?>

 <?php if( is_singular() ) { ?><meta name="description" content="<?php echo get_bloginfo('name'); ?> <?php echo wp_reset_postdata(); echo strip_tags( strip_shortcodes((get_the_excerpt()))); ?>" /><?php } ?>