function add_custom_stock_type() {
?>
<script type="text/javascript">
jQuery(function(){
jQuery('._stock_status_field').not('.custom-stock-status').remove();
});
</script>
<?php
woocommerce_wp_select( array( 'id' => '_stock_status', 'wrapper_class' => 'custom-stock-status', 'label' => __( 'Stock status', 'woocommerce' ), 'options' => array(
'instock' => __( '1', 'woocommerce' ), //changed the name
'outofstock' => __( '2', 'woocommerce' ), //changed the name
'onbackorder' => __( '3', 'woocommerce' ), //changed the name
'cuatro' => __( '4', 'woocommerce' ), //added new one
), 'desc_tip' => true, 'description' => __( 'Controls whether or not the product is listed as "in stock" or "out of stock" on the frontend.', 'woocommerce' ) ) );
}
add_action('woocommerce_product_options_stock_status', 'add_custom_stock_type');
function save_custom_stock_status( $product_id ) {
update_post_meta( $product_id, '_stock_status', wc_clean( $_POST['_stock_status'] ) );
}
add_action('woocommerce_process_product_meta', 'save_custom_stock_status',99,1);
function woo_add_custom_general_fields_save_two( $post_id ){
// Select
$woocommerce_select = $_POST['_stock_status'];
if( !empty( $woocommerce_select ) )
update_post_meta( $post_id, '_stock_status', esc_attr( $woocommerce_select ) );
else
update_post_meta( $post_id, '_stock_status', '' );
}
function woocommerce_get_custom_availability( $data, $product ) {
switch( $product->stock_status ) {
case 'instock':
$data = array( 'availability' => __( '1', 'woocommerce' ), 'class' => 'in-stock' ); //changed name
break;
case 'outofstock':
$data = array( 'availability' => __( '2', 'woocommerce' ), 'class' => 'out-of-stock' ); //changed name
break;
case 'onbackorder':
$data = array( 'availability' => __( '3', 'woocommerce' ), 'class' => 'onbackorder' ); //changed name
break;
case 'cuatro':
$data = array( 'availability' => __( '4', 'woocommerce' ), 'class' => 'cuatro' ); //added new one
break;
}
return $data;
}
add_action('woocommerce_get_availability', 'woocommerce_get_custom_availability', 10, 2);
There you go. Hope it works for you