<?php

/*
  Plugin Name: Fix image in RSS
  Plugin URI: http://fgc.vn
  Description: Fix image in RSS
  Version: 1.0
  Author: Fgc techlution - Ho Ngoc Hang
  Author URI: http://fgc.vn
 */

/**
 * fix and display thumbnail image of post in RSS
 * @global type $post
 * @param type $content
 * @return type
 */
function fgcImageToRSS($content) {
    global $post;
    if (has_post_thumbnail($post->ID)) {
        $content = '<p>' . get_the_post_thumbnail($post->ID, 'medium') . '</p>' . $content;
    }
//”   ″
//$content = preg_replace("/&lt;img[^>]+\&gt;/i", "", $content); 
    $content = preg_replace("/&#60;img[^>]+\&#62;/i", "", $content);
    return $content;
}

add_filter('the_excerpt_rss', 'fgcImageToRSS');
add_filter('the_content_feed', 'fgcImageToRSS');