função para gerar miniaturas no wp

/*-----------------------------*/


// retreives image from the post
function getImage($num) {
global $more;
$more = 1;
$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);
$image[$i] = $postOutput;
$start=$imgEnd+1;

$cleanF = strpos($image[$num],'src="')+5;
$cleanB = strpos($image[$num],'"',$cleanF)-$cleanF;
$imgThumb = substr($image[$num],$cleanF,$cleanB);

}
if(stristr($image[$num],'<img')) { echo $imgThumb; }
$more = 0;
}
//retreive image ends