getImage.php

<?php
/* Display the first image of wordpress post.
   Put these function on file : functions.php
   usage <?php echo _get_first_image(); ?>
*/
function _get_first_image(){
 global $post, $posts;
 $first_img = '';
 ob_start();
 ob_end_clean();
 $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
 
 $first_img="";
 
 if(isset($matches[1][0]))
 $first_img = $matches[1][0];
 
 return $first_img;
}

?>