PHP error in woocommerce_get_availability filter hook

Question

In WooCommerce, for some reason I am getting this error:

Warning: Invalid argument supplied for foreach() in /home//wp-content/themes/flat/functions.php on line 32

The error only appears with simple products, not variable products with multiple variations. This error seems to be at this line :

foreach($available as $i) {

Any help would be amazing!!

Here is my code:

/**
 * Backorder Hook
 **/

function backorder_text($available) {

    foreach($available as $i) {

        $available = str_replace('Available on backorder', 'This size is on backorder : Dont Miss out!<BR><span style="font-weight: normal;">Buy it now and we will dispatch as soon as they arrive</span>', $available);

    }

    return $available;
}
add_filter('woocommerce_get_availability', 'backorder_text');




add_filter( 'woocommerce_get_availability' , 'revised_woocommerce_get_availability' , 10, 2 );

function revised_woocommerce_get_availability( $available_array , $product) {

    if ( $product->managing_stock() ) {

        if ( !($product->is_in_stock() && $product->get_stock_quantity() > get_option( 'woocommerce_notify_no_stock_amount' ))  && ($product->backorders_allowed() && $product->backorders_require_notification())  ) {

            $custom_meta_value = get_post_meta( $product->id, 'Out_of_stock_message', true );
            $available_array["availability"] = $custom_meta_value;

        }

    }
    return $available_array;
}

Answer 1

You can use 2 different hooks for this. And as you are using the same hooks for 2 functions, you can merge it in one function.

The woocommerce_get_availability filter hook: is used in get_availability() method:

public function get_availability() {
    return apply_filters( 'woocommerce_get_availability', array(
        'availability' => $this->get_availability_text(),
        'class'        => $this->get_availability_class(),
    ), $this );
}

So you can see also that it's an array with 2 keys 'availability' and 'class'. The key 'availability' is the one that you need and uses get_availability_text() method and that you can use directly woocommerce_get_availability_text filter hook at the end of the method code.

1) Using woocommerce_get_availability_text filter hook (the best choice):

add_filter( 'woocommerce_get_availability_text', 'customizing_availability_text', 10, 2);
function customizing_availability_text( $availability, $product ) {

    if ( $_product->is_in_stock() )
        $availability = str_replace('Available on backorder', 'This size is on backorder : Dont Miss out!<BR><span style="font-weight: normal;">Buy it now and we will dispatch as soon as they arrive</span>', $availability);

    if ( $product->managing_stock() && !($product->is_in_stock() && $product->get_stock_quantity() > get_option( 'woocommerce_notify_no_stock_amount' ))  && ($product->backorders_allowed() && $product->backorders_require_notification())  ) {
        $availability = get_post_meta( $product->id, 'Out_of_stock_message', true );

    return $availability;
}

2) Using woocommerce_get_availability filter hook.

Here you need to target the 'availability' in the array, this way:

add_filter( 'woocommerce_get_availability', 'customizing_availability_text', 10, 2);
function customizing_availability_text( $availability, $product ) {

    if ( $_product->is_in_stock() )
        $availability['availability'] = str_replace('Available on backorder', 'This size is on backorder : Dont Miss out!<BR><span style="font-weight: normal;">Buy it now and we will dispatch as soon as they arrive</span>', $availability['availability']);

    if ( $product->managing_stock() && !($product->is_in_stock() && $product->get_stock_quantity() > get_option( 'woocommerce_notify_no_stock_amount' ))  && ($product->backorders_allowed() && $product->backorders_require_notification())  ) {
        $availability['availability'] = get_post_meta( $product->id, 'Out_of_stock_message', true );

    return $availability;
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

I haven't test your code as it's very specific, but it should work.

---

Reference: Action and Filter Hook Reference