functions/firstimage.php

<?php // Funzione per mostrare qualunque immagine nel loop
function getImage($num) {
    global $more;
    $more = 1;
    $link = get_permalink();
    $title = get_the_title ();
    $alt = get_the_title ();
    $content = get_the_content();
    $count = substr_count($content, '<img');
    $start = 0;
    for($i=1;$i<=$count;$i++) {
        $imgBeg = strpos($content, '<img', $start);
        $post = substr($content, $imgBeg);
        $imgEnd = strpos($post, '>');
        $postOutput = substr($post, 0, $imgEnd+1);
        $postOutput = preg_replace('/width="([0-9]*)" height="([0-9]*)"/', '/width="200px" height="200px"/',$postOutput);
        $image[$i] = $postOutput;
        $start=$imgEnd+1;
    }
    if(stristr($image[$num],'<img')) { echo '<a title="'.$title.'" href="'.$link.'">'.$image[$num]."</a>"; }
    $more = 0;
};?>
<?php
function get_post_thumbnail() {
$files = get_children('post_parent='.get_the_ID().'&post_type=attachment&post_mime_type=image');
if($files) :
$keys = array_reverse(array_keys($files));
$j=0;
$num = $keys[$j];
$image=wp_get_attachment_image($num, 'large', false);
$imagepieces = explode('"', $image);
$imagepath = $imagepieces[1];
$thumb=wp_get_attachment_thumb_url($num);
print $thumb;
else:
print "http://www.yourdomain.com/wp-content/uploads/2010/02/default-post-thumb.jpg";
endif;
}
?>