import-function.php

<?php

function my_condition( $original ) 
{
	if ( is_numeric( $original ) ) 
		$original = absint( trim( $original ) ) >= 2016 ? 'new' : 'used';

	$makes = array(
		'cons' => 'Used',
		'used' => 'Used',
		'U'	   => 'Used',
		'new'  => 'New',
		'N'    => 'New',
	);

	return match_convert( $original, $makes );
}

function match_convert( $original , $words = '' , $default = 'Used' ) 
{
	if ( empty( $words ) )
		return $default;

	foreach ( $words as $matching_word => $replacement )
	{
		if ( false !== strpos( mb_strtolower( $original ), mb_strtolower( $matching_word ) ) )
			return $replacement;
	}

	return $default;
}