woo-set-minimum-order-total.php

<?php

//Set minimum order amount

function minimum_order_func(){
  global $woocommerce;
  if (is_checkout()){
    $minorder = 1500;

    // If the cart is empty and the order_total less than $minorder (1500)

    if ( ($woocommerce->cart->subtotal < $minorder) && (WC()->cart->get_cart_contents_count() <> 0)){

      wc_add_notice( sprintf(__('Sorry, you have not met the minimum order amount of ' .$minorder.' HUF'), 'woocommerce'), 'error' );
      wp_redirect( get_permalink( woocommerce_get_page_id( 'cart' ) ) );
      exit;
    }
  }
}
add_action('the_post','minimum_order_func',10);
?>