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<?php 
$category = get_queried_object()->slug; // permet de récupérer la catégorie

$myposts = get_posts([
		'showposts' => -1,
		'post_type' => 'product',
		'orderby' => 'date',
	 'order' => 'DESC',
	  'tax_query' => [
        [
          'taxonomy' => 'gamme-taxonomies',
          'field'    => 'slug',
          'terms'    => $category
        ]
      ]
	]
); 
?>