计算文章内图片标签数量

function imgNum($content){
$output = preg_match_all('#<img(.*?) src="([^"]*/)?(([^"/]*)\.[^"]*)"(.*?)>#', $content,$s);
$cnt = count( $s[1] );
return $cnt;
}

<?php echo ''.imgNum($this->content).'' ; ?>

function imgNum($content){
$output = preg_match_all("/<img.<em>?src="(.</em>?)"<sup id="fnref-1"><a href="#fn-1" 
class="footnote-ref">1</a></sup>*>/i", $content,$matches);
$cnt = count( $matches[1] );
return $cnt;
 }

<?php echo ''.imgNum($this->content).'' ; ?>