Duplicate content comment pages

Adding this PHP code to the functions.php of your wordpress theme will prevent duplicated content as a result of multiple comments pages.

function canonical_for_comments() {
	global $cpage, $post;
	if ( $cpage > 1 ) :
		echo "\n";
	  	echo "<link rel='canonical' href='";
	  	echo get_permalink( $post->ID );
	  	echo "' />\n";

add_action( 'wp_head', 'canonical_for_comments' );

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