Display Thumbnails on Wordpress with get_post_thumbnail - php

Question

I'm struggling to display a few post thumbnails on a Wordpress page. I'm using advanced custom fields where I select those featured articles. The featured articles have a featured image. I can display the title and link to the articles correctly, but I'm struggling with the featured images.
<?php
if (is_page('reviews')) {
$featured_articles = get_field('featured_articles');
$id = $featured_articles[0];
echo "<div class='row blog-first'><div class='small-12 columns'><div class='row blog-teaser'>";
echo "<div class='small-8 columns'>";
if ( has_post_thumbnail($id) ) {
echo "<a href='".get_permalink($id)."' class='thumb'>";
echo get_the_post_thumbnail( $id, 'teaser-thumbnail' );
echo "</a>";
}
echo "</div>";
echo "<div class='small-4 columns col-text'>";
echo "<div class='d'></div>";
echo "<a href='".get_permalink($id)."'><h3>".get_the_title($id)."</h3></a>";
echo get_field('text_excerpt',$id);
echo "</div>";
echo "</div></div></div>";
echo "<div class='row'>";
echo "<div class='small-12 medium-8 columns'>";
echo "<h2 class='h2 hc f2'> Our best reviews</h2>";
for ($i=1; $i < 4; $i++) {
$id = $featured_articles[$i];
echo "<div><div class='row blog-teaser'>";
echo "<div class='small-6 columns'>";
if ( has_post_thumbnail($id) ) {
echo "<a href='".get_permalink($id)."' class='image'>";
echo get_the_post_thumbnail( $id, 'teaser-thumbnail' );
$image_large = wp_get_attachment_image_src( get_post_thumbnail_id($id), 'teaser-thumbnail');
echo "</a>";
}
echo "</div>";
echo "<div class='small-6 columns col-text'>";
echo "<div class='d'></div>";
echo "<a href='".get_permalink($id)."'><h3>".get_the_title($id)."</h3></a>";
echo "</div>";
echo "</div></div>";
}
echo "</div>";

Answer 1

Try this:
$featured_articles=get_field('featured_articles');
foreach($featured_articles as $single_feature){
$img_arr=wp_get_attachment_image_src($single_feature,'medium'); //thumbnail,full,medium
if(!empty($img_arr)){
echo '<img src="'.$img_arr[0].'" alt="image">';
}else{
echo '<img src="" alt="NO image">';
}
}