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checks the URL posted by a commenter
function rkv_url_spamcheck( $approved , $commentdata ) {
$author_url = $commentdata['comment_author_url'];
$author_url_length = strlen($author_url);
if ($author_url_length > 50 )
$approved = 'spam';
return $approved;
add_filter( 'pre_comment_approved', 'rkv_url_spamcheck', 99, 2 );
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