custom filed output

function imd_portfolio_meta_box() {
    global $post;
    // get the custom field values as an array
    $values = get_post_custom( $post->ID );
    // extract the members of the $values array to their own variables (which you can see below, in the HTML code)
    extract( $values, EXTR_SKIP );

    // escape the output, just in case
    $allowed_html = array(
        'a' => array(
            'href' => array(),
            'title' => array()
        ),
        'em' => array(),
        'strong' => array()
    );
    $_imd_portfolio_details_output = wp_kses($_imd_portfolio_details[0], $allowed_html);
    $_imd_portfolio_client_output = wp_kses($_imd_portfolio_client[0], $allowed_html);
    $_imd_portfolio_website_output = wp_kses($_imd_portfolio_website[0], $allowed_html);
    $_imd_portfolio_quote_output = wp_kses($_imd_portfolio_quote[0], $allowed_html);
    $output = '<div class="review-box">
        <ul class="review-box-list">
            <li><strong>Details:</strong> '.$_imd_portfolio_details_output.'</li>
            <li><strong>Client:</strong> '.$_imd_portfolio_client_output.'</li>
            <li><strong>Website:</strong> '.$_imd_portfolio_website_output.'</li>
            <li><strong>Quote:</strong>'.$_imd_portfolio_quote_output.'></li>
        </ul>
    </div>';
    return $output;
}