Change Flatsome theme 'Out of Stock' label to 'Sold' - Change the 'Out of stock' banner in Flatsome theme to 'Sold'. https://www.damiencarbery.com/2020/06/change-flatsome-theme-out-of-stock-label-to-sold/

flatsome-out-of-stock-to-sold.php

<?php
/*
Plugin Name: Change Flatsome theme 'Out of Stock' label to 'Sold'
Plugin URI: https://www.damiencarbery.com/2020/06/change-flatsome-theme-out-of-stock-label-to-sold/
Description: Change the 'Out of stock' banner in Flatsome theme to 'Sold'. Also works when [ux_products] shortcode is used.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.3
*/


// Return whether a product is in the Hire category.
function is_hire_category( $product_id ) {
	if ( has_term( array( 'hire' ), 'product_cat', $product_id ) ) {
		return true;
	}
	return false;
}


// Add 'Sold' banner if product is out of stock. CSS will hide the 'Out of Stock' div.
add_action( 'flatsome_woocommerce_shop_loop_images', 'dcwd_add_sold_label' );
function dcwd_add_sold_label() {
	global $product;
	
	if ( ! $product->is_in_stock() ) {
		$message = 'Sold';
		// Mark hire items as Unavailable instead of Sold.
		if ( is_hire_category( $product->get_id() ) ) {
			$message = 'Unavailable';
		}

		echo '<div class="out-of-stock-label sold-label">'.$message.'</div>';
        // Add the CSS to hide the 'Out of Stock' div.
        add_action( 'wp_footer', 'dcwd_hide_out_of_stock_banner' );
	}
}


// Change the 'Out of Stock' text in the single product page too.
add_filter( 'woocommerce_get_availability_text', 'dcwd_get_availability_text', 10, 2 );
function dcwd_get_availability_text( $availability, $product ) {
	if ( ! $product->is_in_stock() ) {
		// Mark hire items as Unavailable instead of Sold.
		if ( is_hire_category($product->get_id() ) ) {
			return 'Unavailable';
		}
		return 'Sold';
	}

	return $availability;
}


// If the content has the [ux_products] shortcode then add the required CSS/JS to the footer.
add_filter( 'the_content', 'dcwd_check_ux_products_shortcode', 5 );
function dcwd_check_ux_products_shortcode( $content ) {
    if ( has_shortcode( $content, 'ux_products' ) ) {
        add_action( 'wp_footer', 'dcwd_change_out_of_stock_banner' );
        add_filter( 'the_content', 'dcwd_change_out_of_stock_text', 20 );
    }
    return $content;
}


// Filter the page content to change the 'Out of stock' div with a 'Sold' one.
function dcwd_change_out_of_stock_text( $content ) {
    return str_replace( '<div class="out-of-stock-label">Out of stock</div>', '<div class="out-of-stock-label sold-label">Sold</div>', $content );
}


// Rotate the label with CSS.
function dcwd_change_out_of_stock_banner() {
?>
<style>
/* Rotate the 'Sold' label. */
.row-masonry .out-of-stock-label.sold-label { /*opacity: 0.9;*/ transform: rotate(-20deg); width: 110%; margin-left: -5%; z-index: 10; }
</style>
<?php
}


// Hide the 'Out of Stock' banner and show the 'Sold' one.
//add_action( 'wp_footer', 'dcwd_hide_out_of_stock_banner' );
function dcwd_hide_out_of_stock_banner() {
?>
<style>
/* Hide 'Out of stock' message and show new 'Sold' one. */
.box-image .out-of-stock-label { opacity:0;}
/* Rotate the 'Sold' label. */
.box-image .out-of-stock-label.sold-label { opacity: 0.9; transform: rotate(-20deg); width: 110%; margin-left: -5%; z-index: 10; }
</style>
<?php
}

Something broke with latest WP update (6.6). Doesn't work anymore on items that are being lazy-loaded.

I cannot reproduce this error. Here's screenshots of an Out of Stock product when the plugin is active and when it is in active.
https://snipboard.io/OW6odx.jpg

Please contact me via https://www.damiencarbery.com/contact/ if you want to investigate this further.