post_thumbnail Wordpress

<?php
$tags = get_the_tags();
foreach ( $tags as $tag ){
$tage = $tag->slug;
}
if ( has_post_thumbnail() ) {
the_post_thumbnail();
}
else { ?>

<?php
echo '<img src="' . get_bloginfo( 'stylesheet_directory' ).'/images/no-image-single.jpeg" alt="'.get_the_title().'" />';
?>

<?php } ?>