Woocommerce | Modify backorder message ( single product and cart )

For single product, add this in fuction.php in your theme folder and change the text ‘Please allow 20 days for delivery of this item’:

/* backorder text on single product page */

function so_42345940_backorder_message( $text, $product ){
  if ( $product->managing_stock() && $product->is_on_backorder( 1 ) ) {
      $text = __( 'Please allow 20 days for delivery of this item', 'your-textdomain' );
  }
  return $text;
}
add_filter( 'woocommerce_get_availability_text', 'so_42345940_backorder_message', 10, 2 );

For “Cart” page, add this in fuction.php in your theme folder and chaneg text ‘Please allow 20 days for delivery of this item ‘:

/* Backorder text on cart page */

function alt_message() {
  return '<p class="backorder_notification backorder_notification_custom">Please allow 20 days for delivery of this item</p>';
}

function backorder_text($availability) {
$altmessage = alt_message();
foreach($availability as $i) {
$availability = str_replace('Available on backorder', $altmessage, $availability);
}
return $availability;
} 
add_filter('woocommerce_get_availability', 'backorder_text');


function woocommerce_custom_cart_item_name( $_product_title, $cart_item, $cart_item_key ) {
$altmessage = alt_message();
  if ( $cart_item['data']->backorders_require_notification() && $cart_item['data']->is_on_backorder( $cart_item['quantity'] ) ) {
$_product_title .=  __( ' - '. $altmessage, 'woocommerce' ) ;
}
return $_product_title;
}
add_filter( 'woocommerce_cart_item_name', 'woocommerce_custom_cart_item_name', 10, 3);

and this in your syle.css

.backorder_notification{
    display: none;
}
.backorder_notification_custom{
    display: block;
    margin-bottom:0px;
}

If you have a multi language website, you find each string in “String translation”

that’s all