自动为wordpress文章图片添加alt属性和title属性

/**
*自动为wordpress文章图片添加alt属性和title属性
*/
function image_alttitle( $imgalttitle ){
global $post;
$category = get_the_category();
$flname=$category[0]->cat_name;
$btitle = get_bloginfo();
$imgtitle = $post->post_title;
$imgUrl = "<img\s[^>]*src=(\"??)([^\" ]*?)\\1[^>]";
if(preg_match_all("/$imgUrl/siU",$imgalttitle,$matches,PREG_SET_ORDER)){
if( !empty($matches) ){
for ($i=0; $i < count($matches); $i++){
$tag = $url = $matches[$i][0];
$j=$i+1;
$judge = '/title=/';
preg_match($judge,$tag,$match,PREG_OFFSET_CAPTURE);
if( count($match) < 1 ) $altURL = ' alt="'.$imgtitle.' '.$flname.' 第'.$j.'张-'.$btitle.'" title="'.$imgtitle.' '.$flname.' 第'.$j.'张-'.$btitle.'" ';
$url = rtrim($url.'');
$url .=  $altURL.'';
$imgalttitle = str_replace($tag,$url,$imgalttitle);
}
}
}
return $imgalttitle;
}
add_filter( 'the_content','image_alttitle');