error when upgrading PHP 8.0

Hi @devsaredead,

This error is coming from one of the snippets you’ve added.

Are you able to post the full error message? We’re looking for a snippet that’s at least 11 lines long.

yes, the full error is this:

Fatal error: Uncaught Error: Call to undefined function create_function() in /…/wp-content/plugins/code-snippets/php/snippet-ops.php(582) : eval()’d code:11 Stack trace: #0 /…/wp-content/plugins/code-snippets/php/snippet-ops.php(582): eval() #1 /…/wp-content/plugins/code-snippets/php/snippet-ops.php(663): Code_Snippets\execute_snippet(‘//**** SHOP PAG…’, 17) #2 /…/wp-includes/class-wp-hook.php(324): Code_Snippets\execute_active_snippets(”) #3 /…/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #4 /…/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /…/wp-settings.php(550): do_action(‘plugins_loaded’) #6 /…/wp-config.php(98): require_once(‘/home/agenda/ba…’) #7 /…/wp-load.php(50): require_once(‘/…’) #8 /…/wp-blog-header.php(13): require_once(‘/…/’) #9 /…/index.php(17): require(‘/…’) #10 {main} thrown in /…/wp-content/plugins/code-snippets/php/snippet-ops.php(582) : eval()’d code on line 11

I have noticed the //**** SHOP PAG tag, so I went to disable the single snippet and it fixes the error. The problem is that it’s a snippet with several functions related to Woocommerce, so it’s hard to spot which one in particular

create_function is very old PHP syntax. If you know which snippet is causing the problem, share the code here and I might be able to help you fix it up.

….would you be really so kind to review this long snippets? (some are commented, i.e. not currently in use)

//**** SHOP PAGE ****// 

// 0) MAIN SHOP DESCRIPTION
function avs_shop_description() {
$description = '<p class="storemotto">SEGUITE IL VOSTRO ISTINTO... COMPRATE DA NOI</p>';
echo $description;
}
add_action('woocommerce_archive_description', 'avs_shop_description');

// 1) CHANGE NUMBER OF PRODUCTS DISPLAYED PER PAGE
add_filter( 'loop_shop_per_page', create_function( '$products', 'return 9;' ), 30 );

// 2) HIDE CATEGORY PRODUCT COUNT IN PRODUCT ARCHIVES
add_filter( 'woocommerce_subcategory_count_html', '__return_false' );

// 3) SHOW CATEGORY BELONGING TO EACH PRODUCT
add_action( 'woocommerce_shop_loop_item_title', 'avs_show_all_subcats', 2 );
function avs_show_all_subcats() {
   global $product;
   $cats = get_the_terms( $product->get_id(), 'product_cat' );
   if ( empty( $cats ) ) return;
   echo join( ', ', wp_list_pluck( $cats, 'name' ) );
}

// 4a) PRICE DISPLAY "Free" IF ZERO OR "non disponibile" IF EMPTY
add_filter( 'woocommerce_get_price_html', 'avs_price_free_zero_empty', 9999, 2 );
function avs_price_free_zero_empty( $price, $product ){
    if ( 0 == $product->get_price() ) { $price = '<span class="woocommerce-Price-amount amount">omaggio</span>'; }
    if ( '' === $product->get_price() ) { $price = '<span class="woocommerce-Price-amount amount">prezzo n/d</span>'; }  
    return $price;
}

// 4b) CATALOGUE DISPLAY "non disponibile" IF OUT OF STOCK
add_filter( 'woocommerce_product_add_to_cart_text', 'avs_archive_custom_cart_button_text' );
function avs_archive_custom_cart_button_text( $text ) {
   global $product;       
   if ( $product && ! $product->is_in_stock() ) {           
      return 'non disponibile';
   } 
   return $text;
}

// 5a) ALLOW/DISALLOW GUEST CHECKOUT OF THE PRODUCT (ADDS A METABOX IN THE PRODUCT) 
// source: https://gist.github.com/contemplate/2adc7be2c72d585a07ac6f90b1f1e1b4 (https://gist.github.com/mikejolley/5fadb94dd9eff11ab512)
// Display Guest Checkout Field
add_action( 'woocommerce_product_options_general_product_data', 'woo_add_custom_general_fields' );
function woo_add_custom_general_fields() {
  global $woocommerce, $post;
  echo '<div class="options_group">';
  // Checkbox
  woocommerce_wp_checkbox( 
  array( 
	'id'            => '_allow_guest_checkout', 
	'label'         => __('Checkout', 'woocommerce' ), 
	'description'   => __('Permetti acquisto senza registrarsi (Guest Checkout)', 'woocommerce' ) 
	)
   );
  echo '</div>';
}
// Save Guest Checkout Field
add_action( 'woocommerce_process_product_meta', 'woo_add_custom_general_fields_save' );
function woo_add_custom_general_fields_save( $post_id ){
	$woocommerce_checkbox = isset( $_POST['_allow_guest_checkout'] ) ? 'yes' : 'no';
	update_post_meta( $post_id, '_allow_guest_checkout', $woocommerce_checkbox );
}
// Enable Guest Checkout on Certain products
add_filter( 'pre_option_woocommerce_enable_guest_checkout', 'enable_guest_checkout_based_on_product' );
function enable_guest_checkout_based_on_product( $value ) {
  if ( WC()->cart ) {
    $cart = WC()->cart->get_cart();
    foreach ( $cart as $item ) {
      if ( get_post_meta( $item['product_id'], '_allow_guest_checkout', true ) == 'yes' ) {
        $value = "yes";
      } else {
        $value = "no";
        break;
      }
    }
  }
  return $value;
}

// 5b) FREE DOWNLOADS (PRODUCTS) WITHOUT CHECKOUT
//function direct_free_downloads_button($button)
//{
//    global $product;
//    if( $product->is_downloadable() AND $product->get_price() == 0 )
//    {
//        $files = $product->get_files();
//        $files = array_keys($files);
//        $download_url = home_url('?download_file='.$product->id.'&key='.$files[0].'&free=1' );
//        $button = sprintf( '<a href="%s" rel="nofollow" data-product_id="%s" data-product_sku="%s" data-quantity="%s" class="button %s product_type_%s">%s</a>',
//            esc_url( $download_url  ),
//            esc_attr( $product->id ),
//            esc_attr( $product->get_sku() ),
//           esc_attr( isset( $quantity ) ? $quantity : 1 ),
//            $product->is_purchasable() && $product->is_in_stock() ? '' : '',
//           esc_attr( $product->product_type ),
//            esc_html( 'omaggio' )
//        );
//    }
//    return $button;
//}
//add_filter('woocommerce_loop_add_to_cart_link', 'direct_free_downloads_button', 100);
//
/**  Handles downloading of free Downloadable products * @return [type] [description]  */
//function download_free_product_file()
//{
//    $product_id    = absint( $_GET['download_file'] );
//    $_product      = wc_get_product( $product_id );
//
//    if( $_product->get_price() == 0 ) {
//        WC_Download_Handler::download( $_product->get_file_download_path( filter_var($_GET['key'], FILTER_SANITIZE_STRING)  ), $product_id );
//    }
//}
//if ( isset( $_GET['download_file'] ) && isset( $_GET['key'] ) && $_GET['free'] ) {
//    add_action( 'init', 'download_free_product_file' );
//}



//** PRODUCT PAGE **// 

// 6a) ADD Back-to-store BUTTON IN PRODUCT PAGE
add_action('woocommerce_single_product_summary', 'avs_back_to_store', 45);
// 6b) ADD Back-to-store BUTTON IN CHECKOUT PAGE
add_action( 'woocommerce_cart_actions', 'avs_back_to_store' );
function avs_back_to_store() { ?>
<a class="button wc-backward" href="<?php echo get_permalink( wc_get_page_id( 'shop' ) ); ?>"><?php _e( 'tornare al Duty Free', 'woocommerce' ) ?></a>
<?php
}

// 7) SHOW CATEGORY TITLE IN PRODUCT PAGE
add_filter( 'woocommerce_show_page_title', 'not_a_shop_page' );
function not_a_shop_page() {
    return boolval(!is_shop());
}

// 8) SHOW DEFAULT DESCRIPTION WHEN SHORT ONE IS EMPTY
add_action( 'woocommerce_single_product_summary', 'avs_echo_short_desc_if_empty', 21 );
function avs_echo_short_desc_if_empty() {
   global $post;
   if ( empty ( $post->post_excerpt  ) ) {
      $post_excerpt = '<p>';
      $post_excerpt .= 'Questo articolo è pubblicato dalla Redazione a seguito di una ricerca di mercato indipendente.<br>Il produttore/distributore può gestirne la promozione e le vendite <a href="/membership-account/membership-levels/">registrando la propria azienda.</a>';
      $post_excerpt .= '</p>';
      echo $post_excerpt;
   }
}

// 9) CHANGE Add-to-Cart BUTTON LABEL IF PRODUCT IS ALREADY IN CART
// Edit Single Product Page Add to Cart
add_filter( 'woocommerce_product_single_add_to_cart_text', 'avs_custom_add_cart_button_single_product' );
function avs_custom_add_cart_button_single_product( $label ) {
   foreach( WC()->cart->get_cart() as $cart_item_key => $values ) {
      $product = $values['data'];
      if( get_the_ID() == $product->get_id() ) {
         $label = __('aggiungere ?', 'woocommerce');
      }
   }
   return $label;
}
// Edit Loop Pages Add to Cart
add_filter( 'woocommerce_product_add_to_cart_text', 'avs_custom_add_cart_button_loop', 99, 2 );
function avs_custom_add_cart_button_loop( $label, $product ) {
   if ( $product->get_type() == 'simple' && $product->is_purchasable() && $product->is_in_stock() ) {
      foreach( WC()->cart->get_cart() as $cart_item_key => $values ) {
         $_product = $values['data'];
         if( get_the_ID() == $_product->get_id() ) {
            $label = __('Aggiungere ?', 'woocommerce');
         }
      }
   }
   return $label;
}

// 10) MOVE RELATED PRODUCTS INTO A NEW DESCRIPTION TAB
// remove related products from their original position
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20);
// add a new tab
add_filter( 'woocommerce_product_tabs', 'woo_new_product_tab' );
function woo_new_product_tab( $tabs ) {
$tabs['related_products'] = array(
   'title'    => __( 'PRODOTTI ANALOGHI', 'woocommerce' ),
   'priority'    => 50,
   'callback'    => 'woo_new_product_tab_content'
);
   return $tabs;
}
// put the related products inside tab
function woo_new_product_tab_content() {
woocommerce_output_related_products();
}



//** CART PAGE **// 

// 11) SHOW TOTAL WEIGHT IN CART
add_action( 'woocommerce_before_cart', 'avs_print_cart_weight' );
add_action( 'woocommerce_before_checkout_form', 'avs_print_cart_weight' );
function avs_print_cart_weight() {
   $notice = 'Il Vostro bagaglio pesa: ' . WC()->cart->get_cart_contents_weight() . get_option( 'woocommerce_weight_unit' );
   if ( is_cart() ) {
      wc_print_notice( $notice, 'notice' );
   } else {
      wc_add_notice( $notice, 'notice' );
   }
}

// 12) DISPLAY Regular/Sale SUBTOTAL IN CART TABLE
add_filter( 'woocommerce_cart_item_price', 'avs_change_cart_table_price_display', 30, 3 );
function avs_change_cart_table_price_display( $price, $values, $cart_item_key ) {
   $slashed_price = $values['data']->get_price_html();
   $is_on_sale = $values['data']->is_on_sale();
   if ( $is_on_sale ) {
      $price = $slashed_price;
   }
   return $price;
}

// 13) DISPLAY CATEGORIES UNDER PRODUCTS NAMES IN CART TABLE
add_filter( 'woocommerce_cart_item_name', 'avs_cart_item_category', 9999, 3 );
function avs_cart_item_category( $name, $cart_item, $cart_item_key ) {
   $product = $cart_item['data'];
   if ( $product->is_type( 'variation' ) ) {
      $product = wc_get_product( $product->get_parent_id() );
   }
   $cat_ids = $product->get_category_ids();
   if ( $cat_ids ) $name .= '<br>' . wc_get_product_category_list( $product->get_id(), ', ', '<span class="posted_in">' . _n( 'Category:', 'Categories:', count( $cat_ids ), 'woocommerce' ) . ' ', '</span>' );
   return $name;
}



//** CHECKOUT PAGE **// 

// 14) MESSAGE OF REMAINING COST TO ENABLE FREE SHIPPING
function avs_avviso_sped_free() {
   $min_free = 50; // importo minimo per spedizione gratuita impostato su WooCommerce
   $cart_now = WC()->cart->subtotal;
   if ( $cart_now < $min_free ) {
      $added_text = 'Attenzione: aggiungendo ulteriori <strong>' . wc_price( $min_free - $cart_now ) . '</strong> al bagaglio, la spedizione sarà gratuita.';
      $notice = sprintf( $added_text );
      wc_print_notice( $notice, 'notice' );
   } 
}
add_action( 'woocommerce_before_checkout_form', 'avs_avviso_sped_free' );

// 15) ADD Back-to-cart BUTTON IN CHECKOUT PAGE
add_action( 'woocommerce_before_checkout_form', 'avs_return_to_cart_notice_button' );
function avs_return_to_cart_notice_button(){
    $message = __('Avete altro da dichiarare?', 'woocommerce');
    $button_text = __('mostrate nuovamente il babaglio', 'woocommerce');
    $cart_link = WC()->cart->get_cart_url();
    wc_add_notice( '<a href="' . $cart_link . '" class="button wc-forward">' . $button_text . '</a>' . $message, 'notice' );
}
add_filter('ywctm_modify_woocommerce_after_shop_loop_item', '__return_false');

// 16a) HIDE BILLING DETAILS FROM CHECKOUT IF ONLY VIRTUAL PRODUCTS 
add_filter( 'woocommerce_checkout_fields' , 'avs_simplify_checkout_virtual' );
function avs_simplify_checkout_virtual( $fields ) {
   $only_virtual = true;
   foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
      // Check if there are non-virtual products
      if ( ! $cart_item['data']->is_virtual() ) $only_virtual = false;   
   }
    if( $only_virtual ) {
       unset($fields['billing']['billing_company']);
       unset($fields['billing']['billing_address_1']);
       unset($fields['billing']['billing_address_2']);
       unset($fields['billing']['billing_city']);
       unset($fields['billing']['billing_postcode']);
       unset($fields['billing']['billing_country']);
       unset($fields['billing']['billing_state']);
       unset($fields['billing']['billing_phone']);
       add_filter( 'woocommerce_enable_order_notes_field', '__return_false' );
     }
     return $fields;
}

// 16b) HIDE BILLING DETAILS FROM CHECKOUT IF SHIPPING METHOD IS LOCALPICKUP
add_filter('woocommerce_checkout_fields', 'avs_remove_billing_checkout_fields');
function avs_remove_billing_checkout_fields($fields) {
	$shipping_method ='local_pickup:2'; // Value of the applicable shipping method.
	global $woocommerce;
		$chosen_methods = WC()->session->get( 'chosen_shipping_methods' );
		$chosen_shipping = $chosen_methods[0];
	if ($chosen_shipping == $shipping_method) {
		unset($fields['billing']['billing_address_1']); // Value of field name to be hidden
		unset($fields['billing']['billing_address_2']);
	    unset($fields['billing']['billing_city']);
        unset($fields['billing']['billing_postcode']);
        unset($fields['billing']['billing_country']);
        unset($fields['billing']['billing_state']);
        unset($fields['billing']['billing_phone']);
	}
	return $fields;
}

// 17) DISPLAY original/coupon-discounted SUBTOTAL IN CHECKOUT TABLE
add_filter( 'woocommerce_cart_subtotal', 'avs_slash_cart_subtotal_if_discount', 9999, 3 );
function avs_slash_cart_subtotal_if_discount( $cart_subtotal, $compound, $cart ){
   if ( $cart->get_cart_discount_total() > 0 ) {
      return wc_format_sale_price( $cart->get_subtotal(), $cart->get_subtotal() - $cart->get_cart_discount_total() );
   }
   return $cart_subtotal;
}

// 18) PRODUCT IMAGES AT CHECKOUT and ORDER PAGE
//add_filter( 'woocommerce_cart_item_name', 'avs_product_image_review_order_checkout', 9999, 3 );
//function avs_product_image_review_order_checkout( $name, $cart_item, $cart_item_key ) {
//    if ( ! is_checkout() ) return $name;
//    $product = $cart_item['data'];
//    $thumbnail = $product->get_image( array( '50', '50' ), array( 'class' => 'alignleft' ) );
//    return $thumbnail . $name;
//}

add_filter( 'woocommerce_cart_item_name', 'avs_product_image_on_checkout', 10, 3 );
function avs_product_image_on_checkout( $name, $cart_item, $cart_item_key ) {  
/* Return if not checkout page */
if ( ! is_checkout() ) {return $name;}
/* Get product object */
$_product = apply_filters( 'woocommerce_cart_item_product', $cart_item['data'], $cart_item, $cart_item_key );
/* Get product thumbnail */
$thumbnail = $_product->get_image();
/* Add wrapper to image and add some css */
$image = '<div style="width:52px;padding:0 7px 7px 0;display:inline-block;vertical-align:top;">' . $thumbnail . '</div>';
/* Prepend image to name and return it */
return $image . $name;
}

add_filter( 'woocommerce_order_item_name', 'avs_product_image_on_order_pay', 10, 3 );
function avs_product_image_on_order_pay( $name, $item, $extra ) {
/* Return if not checkout page */
if ( ! is_checkout() ) {return $name;}
$product_id = $item->get_product_id();
/* Get product object */
$_product = wc_get_product( $product_id );
/* Get product thumbnail */
$thumbnail = $_product->get_image();
/* Add wrapper to image and add some css */
$image = '<div style="width:52px;padding:0 7px 7px 0;display:inline-block;vertical-align:top;">' . $thumbnail . '</div>';
/* Prepend image to name and return it */
return $image . $name;
}

 add_filter( 'woocommerce_checkout_product_title', 'my_add_order_review_product_image', 10, 2 );
// XX) PLACEHOLDERS IN CHECKOUT FORMS
//add_filter( 'woocommerce_checkout_fields', 'avs_labels_inside_checkout_fields', 9999 );
//function avs_labels_inside_checkout_fields( $fields ) {
//   foreach ( $fields as $section => $section_fields ) {
//      foreach ( $section_fields as $section_field => $section_field_settings ) {
//         $fields[$section][$section_field]['placeholder'] = $fields[$section][$section_field]['label'];
//         $fields[$section][$section_field]['label'] = '';
//      }
//   }
//   return $fields;
//}



//** USER MY-ACCOUNT PAGE **// 

// 19) PRINT CUSTOMER AVATAR IN MY-ACCOUNT PAGE
 function avs_myaccount_customer_avatar() {
     $current_user = wp_get_current_user();
     echo '<div class="myaccount_avatar">' . get_avatar( $current_user->user_email, 72, '', $current_user->display_name ) . '</div>';
 }
 add_action( 'woocommerce_account_content', 'avs_myaccount_customer_avatar', 5 );

// 20) DISPLAY ALL PRODUCTS PURCHASED BY USER INTO HIS MY-ACCOUNT PAGE
add_shortcode( 'my_purchased_products', 'avs_products_bought_by_curr_user' );
function avs_products_bought_by_curr_user() {
    // get current user
    $current_user = wp_get_current_user();
    if ( 0 == $current_user->ID ) return;
    // get user orders (completed + processing)
    $customer_orders = get_posts( array(
        'numberposts' => -1,
        'meta_key'    => '_customer_user',
        'meta_value'  => $current_user->ID,
        'post_type'   => wc_get_order_types(),
        'post_status' => array_keys( wc_get_is_paid_statuses() ),
    ) );
    // loop through orders and get products IDs
    if ( ! $customer_orders ) return;
    $product_ids = array();
    foreach ( $customer_orders as $customer_order ) {
        $order = wc_get_order( $customer_order->ID );
        $items = $order->get_items();
        foreach ( $items as $item ) {
            $product_id = $item->get_product_id();
            $product_ids[] = $product_id;
        }
    }
    $product_ids = array_unique( $product_ids );
    $product_ids_str = implode( ",", $product_ids );
    // pass product IDs to products shortcode
    return do_shortcode("[products ids='$product_ids_str']");
}

// 21) DISPLAY USER'S WISHLIST INTO HIS MY-ACCOUNT PAGE
// 1. Register new endpoint (URL) for My Account page  (Note: Re-save Permalinks or it will give 404 error, the flush rule makes unnecessary to save permalinks)
//function avs_add_wishlist_endpoint() {
//    add_rewrite_endpoint( 'wishlist', EP_ROOT | EP_PAGES );
//	flush_rewrite_rules();
//}
//add_action( 'init', 'avs_add_wishlist_endpoint' );
// 2. Add new query var  
//function avs_wishlist_query_vars( $vars ) {
//    $vars[] = 'wishlist';
//    return $vars;
//}
//add_filter( 'query_vars', 'avs_wishlist_query_vars', 0 );
// 3. Insert the new endpoint into the My Account menu
//function avs_add_wishlist_link_my_account( $items ) {
//    $items['wishlist'] = 'DESIDERATI';
//    return $items;
//}
//add_filter( 'woocommerce_account_menu_items', 'avs_add_wishlist_link_my_account' );
// 4. Add content to the new tab  (Note: add_action must follow 'woocommerce_account_{your-endpoint-slug}_endpoint' format)
//function avs_wishlist_content() {
//   echo '<p>Questa è la lista degli acquisti che desiderate fare in un secondo momento... ma attenti a non far scappare le offerte!</p>';
//   echo do_shortcode( ' [woosw_list] ' );
//}
//add_action( 'woocommerce_account_wishlist_endpoint', 'avs_wishlist_content' );

Hi @devsaredead,

The issue is with this line here:

add_filter( 'loop_shop_per_page', create_function( '$products', 'return 9;' ), 30 );

Replacing it with this instead should solve the issue:

add_filter( 'loop_shop_per_page', function ( $products ) { return 9; }, 30 );

Thank you, I have now ruled out the error related to this plugin. Now I’ll try to fix the other ones. ??