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Automatically spam comments with a very long url – http://www.catswhocode.com/blog/best-wordpress-snippets-hacks-and-tips-from-2013
<?php
function url_spamcheck( $approved , $commentdata ) {
return ( strlen( $commentdata['comment_author_url'] ) > 50 ) ? 'spam' : $approved;
}
add_filter( 'pre_comment_approved', 'url_spamcheck', 99, 2 );
?>
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