I'm trying to modify my custom wp theme and add related post block. I want to add default thumbnail for posts which doesn't have it. Below code is working fine but i can't archive how to add default img.
$args = array( 'numberposts' => '4','post__not_in' => array($post->ID));
$recent_posts = wp_get_recent_posts($args);
foreach( $recent_posts as $recent ) {
if($recent['post_status']=="publish") {
if ( has_post_thumbnail($recent["ID"])) {
echo '<div><a href="' . get_permalink($recent["ID"]) . '" title="Look '.esc_attr($recent["post_title"]).'" >' . get_the_post_thumbnail($recent["ID"], 'thumbnail'). $recent["post_title"].'</a></div> ';
} else {
echo '<div><a href="' . get_permalink($recent["ID"]) . '" title="Look '.esc_attr($recent["post_title"]).'" >' . $recent["post_title"].'</a></div>';
}
}
}