Woocommerce: Multiple PHP errors in Site

Hi everyone, This site of mine was running all this while suddenly this morning, it had reverted to the twentyfifteen theme. So looking through the admin, I noticed the old theme was broken. I re-uploaded the theme, and now I get the following errors:

PHP Warning: in_array() expects parameter 2 to be array, string given

PHP Warning: in_array() expects parameter 2 to be array, string given

PHP Fatal error: Call to undefined function WC()

This is for the first error The second error code is similar to this

if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
function trizzy_woocommerce_recent_products( $atts, $content ) {
    extract(shortcode_atts(array(
        'orderby'=> 'date',
        'order'=> 'DESC',
        'per_page'  => '12',
        'category'  => '',
        'ids' => '',
        ), $atts));

global $woocommerce, $product;

This is for the third error:

<div class="cart-btn">
    <a href="#" class="button adc"><?php echo WC()->cart->get_cart_subtotal(); ?></a>
    </div>