Limit Quantity for low stock items

limit-low-stock-woo.php

<?php
function limit_wc_stock() {
    global $product;
    if ( $product->stock ) { 
        if ( number_format($product->stock,0,'','') < 100 ) { // If stock is less than 100
            /* Limit Quantity */
            function limit_wc_stock_quantity_args( $args, $product ) {
            $args['max_value']      = 10;   // Max value
            return $args;
            }
        }
    }
}
 
add_action('woocommerce_after_shop_loop_item','limit_wc_stock', 10);
add_filter( 'woocommerce_quantity_input_args', 'limit_wc_stock_quantity_args', 10, 2 );