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Set comment as pending if author link greater than 50 characters

This simple snippet will set any comment to a pending status whenever the comment author URL is greater than 50 characters long. This is of course not the best way to avoid spam, as lots of tools exist that are more accurate. However, this is a simple method that can help, and if nothing else this is some interesting code you can learn from.

function comment_url_lengthcheck( $approved , $commentdata ) {
	return ( strlen( $commentdata['comment_author_url'] ) > 50 ) ? '0' : $approved;
}
add_filter( 'pre_comment_approved', 'comment_url_lengthcheck', 99, 2 );

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