The value is from get_option('blogname')
, so you can filter pre_option_blogname
:
add_filter( 'pre_option_blogname', 'wpse_78345_blogname' );
function wpse_78345_blogname()
{
return 'Haha!';
}
Do not filter option_blogname
. This is wrong: you are wasting time with that, because WordPress will parse the option cache for the stored result, and then you don’t even use it.
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