DEDECMS怎么给图集图片加上自动编号

$ctp->LoadSource($innerText);

$GLOBALS['autoindex'] = 0;

$revalue .= $ctp->GetResult();

$GLOBALS['autoindex']++;

[field:global name=autoindex/]

{dede:productimagelist} 
<span id="[field:global name=autoindex/]"><img src="[field:imgsrc/]" width="805" height="523" /></span> 
{/dede:productimagelist}

<span id="0"><img src="1.jpg" width="805" height="523" /></span> 
<span id="1"><img src="2.jpg" width="805" height="523" /></span> 
<span id="2"><img src="3.jpg" width="805" height="523" /></span>