如何仅在wordpress中将过滤器添加到single.php？

Question

I want to add nofollow rel to tag cloud on single post only. This function code in functions.php works fine but I couldn't figure it out how to restrict it to single.php only.

function szub_nofollow_tag($text) {
return str_replace('<a href=', '<a rel="nofollow" href=',  $text);
}


add_filter('wp_tag_cloud', 'szub_nofollow_tag');    

Could you please tell me how to do it??

Answer 1

http://codex.wordpress.org/Function_Reference/is_singular

Should do the trick, remember to use it inside the function itself as I don't think WordPress knows if it's true/false while parsing functions.php

function szub_nofollow_tag($text) {
    if ( is_singular() )
        return str_replace('<a href=', '<a rel="nofollow" href=',  $text);
    else
        return $text;
}


add_filter('wp_tag_cloud', 'szub_nofollow_tag');