Excerpt of Posts posting wrong excerpts….

Could use some help… using this code to call up a custom number of posts from a certain category a few times. I only want to display the first 15 or so words… However, it is showing the same excerpt (or a random one) on each post versus showing the unique excerpt for each post. Can anyone help me out on this one? The permalink, title and thumbail are all working/diplaying but the Code below is resulting in the same excerpt to be added to the posts

I’m a bit of a novice so if you can explain I’d gladly appreciate it!

<?php $posts = get_posts('category=3&orderby=date&numberposts=3'); foreach($posts as $post) { ?>
<a href="<?php the_permalink() ?>" target="_parent">
<div class="aligncenter" style="display: block;">
<?php the_post_thumbnail( 'thumbnail', array( 'class' => 'img-responsive' ) ); ?>
</div>
<h3><?php the_title(); ?></h3></a>
<?php while (have_posts()) : the_post(); ?>
<?php echo excerpt(15); ?>
<?php endwhile; ?>
<a href="<?php the_permalink() ?>" class="blue"" target="_parent">
Read More</a>
</div>
<?php } ?>

This is on the page multiple times

and my function.php

function excerpt($limit) {
$excerpt = explode(' ', get_the_excerpt(), $limit);
if (count($excerpt)>=$limit) {
array_pop($excerpt);
$excerpt = implode(" ",$excerpt).'...';
} else {
$excerpt = implode(" ",$excerpt);
}
$excerpt = preg_replace('<code>\[[^\]]*\]</code>','',$excerpt);
return $excerpt;
}

function content($limit) {
$content = explode(' ', get_the_content(), $limit);
if (count($content)>=$limit) {
array_pop($content);
$content = implode(" ",$content).'...';
} else {
$content = implode(" ",$content);
}
$content = preg_replace('/\[.+\]/','', $content);
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
return $content;